Xbase : File format description / Erik Bachmann. - Roskilde, Denmark : Clickety Click Software, 1996-2003. - HTML document
URL: http://www.clicketyclick.dk/databases/xbase/format/index.html
The Oasis is a Clipper Programmers Source Code Archive / Phil Barnett.
Abstract: The Oasis is the largest and best maintained file archive for CA-Clipper and xBase on the web, and is still growing! The Oasis is created specifically for Clipper programmers to satisfy their need for demo's, utilities, Clipper source code, patches and libraries. The Oasis evolved from the FIDO filebone, additions from FIDO message bases, messages from the internet comp.lang.clipper newsgroup, my personal source code and utility donations and other programmers donations directly into the site.
URL: http://www.the-oasis.net/
The File Formats Handbook / Günter Born. - London : Thomson, 1995. - 1274 pg. - ISBN 1-85032-117-5
DbfNtx / Boris Botstein
A set of simple classes to access dbf && ntx files from C++ programm. Thread safe. Easy to use and modify, because sources are as small as possible.
URL: http://www.simtel.net/pub/simtelnet/win95/prog/dbfntx11.zip ; 
Advanced programmer's guide featuring dBASE III and dBASE II / L. Castro. - Culver City, California, USA : Ashton-Tate, 1985. - 10+664 pg. - ISBN 0-912677-05-8
Note: Literature list and Terminology list
Found at: http://loki.borland.com/winbin/bds.exe?getdoc+2821+Delphi
Found at: http://www.itk.ru/english/index.shtml
Object orientired, CA-Clipper compatible compiler
TPDB 3.14 :Turbo Pascal Tools for dBASE / Brian Corll Size 63840 bytes, Date 1991-01-30
Abstract: Object Oriented Database Toolbox fore Turbo Pascal 6.0 Utilizing dBASE Compatible Data Files. Allows you to access, index, search, read and write database files that were created with dBASE III or III Plus, using 75+ Turbo Pascal procedures and functions written specifically for these purposes, and implementing object-oriented techniques. This toolbox supports multiple data files and associated indexes (NOT dBASE INDEXES !) limited only by available memory and file handles allowed by DOS. Index keys can be up to 254 characters, and can be composed of multiple fields or expressions which evaluate to a string not longer than 254 characters.
URL: http://www.simtel.net/pub/pd/51218.html
Data File Header Structure for the dBASE Version 7 Table File. - 44k
URL: www.dbase.com/KnowledgeBase/int/db7_file_fmt.htm
Fixing dBASE DOS applications for Year 2000 Compliance
URL: http://members.aol.com/adechert/y2kscan.htm
DBF : A set of tools and library routines to manipulate xbase files / Brad Eacker : Silicon Graphics, 1994. - Computer files ; C source ; ASCII text
Note: UUNET vol. 43 1994
Abstract: UUnet : volume43 (Period: 08 Jun 94 - 24 Jul 94), dbf/part0[1-2]
: dbf - xbase manipulation package ;
URL: ftp://ftp.uu.net/usenet/comp.sources.misc/volume43/dbf/part01.Z
URL: ftp://ftp.uu.net/usenet/comp.sources.misc/volume43/dbf/part02.Z
URL: http://support.microsoft.com/support/kb/articles/q98/7/43.asp
Abstract: TDbf is a TTable like component for single-user application. It allow you to use DBF tables in your small delphi project with no need of any big dll and without to have to install the BDE.
URL: http://www.tdbf.net
Found at: http://www.fship.com/pub/multisoft/flagship/docu/dbfspecs.txt
libdbf : simple routines for accessing xbase data files / Rasca Gmelch. - Berlin, 1996. - Computer files ; C source ; ASCII text
Found at: http://home.pages.de/~rasca/dbflib/
The Programmers's PC sourcebook : Reference tables for IBM PCs and compatibles, PS/2 systems, EISA-based systems, MS-DOS operating system through version 5, Microsoft Windows through version 3 : Hundred of new charts and tables / T. Hogan. - Redmond, Washington, USA : Microsoft Press, 1991. - Multiple pagination. - ISBN 1-55615-321-X
Harbour is a free software compiler for the xBase superset language often referred to as Clipper (the language that is implemented by the compiler CA-Clipper). Harbour's chosen base implementation is, for the moment, the 5.2e version of CA-Clipper. This isn't to say that the additions found in 5.3 won't make it into Harbour, it simply reflects the fact that many Clipper programmers see 5.2e as the "last best" implementation of Clipper.
URL: http://www.harbour-project.org/
This product provides C and C++ programmers a class and function library
for manipulating Xbase type datafiles and indices.
XBase DBMS currently includes routines to support multi-user access for
.DBF databases, fields, Dbase IV memo fields (variable length fields),
dates, record and file locking and indexes (.NDX). There is also an HTML
user interface class which works well with the Apache Web Server. Future
releases will support filters, enhanced .MDX index files, transaction
support, Dbase III memo fields, a client server configuration, secure
data options and other enhancements requesteed by anyone using this
library.
Found at: http://www.startech.keller.tx.us/xbase/xbase.html
It appears that Gary Kunkel has given up this module and turned it into a public project at SourceForge.net. Version 2.0 is now available at:
URL: http://sourceforge.net/projects/xdb/
Found at: http://support.microsoft.com/support/kb/articles/q139/7/58.asp
URL: http://www.americancoders.com/
Package DBD::XBase contains module XBase that can read and write dbf and dbt file, and also alpha release of DBI driver, that will be further extended to support everything required by DBI 0.92.
URL: http://www.fi.muni.cz/~adelton/perl/
URL: http://search.cpan.org/~janpaz/DBD-XBase-0.241/
Xbase.pm v. 1.07 : a module for perl 5
URL: http://search.cpan.org/author/PRATP/
Outdated. Try: Jan Pazdziora's "Module for dealing with XBase files".
The new application development family that leverages the traditional strengths of Clipper and Xbase while exploiting the power of Linux and the memory management of 32-bit Windows.
php Reference Manual / The PHP Documentation Group
These functions allow you to access records stored in dBase-format (dbf) databases.
URL: http://www.php.net/manual/ref.dbase.php
URL: http://www.americancoders.com/RexxBase.html
CxBase : A Perl Library for manipulating Xbase files / Doug Seay
Author Source: CxBase.zip
Author Address: seay@absyss.fr
It seems to be unsupported :-)
dBASE III PLUS : Programmer's Reference Guide / Alan Simpson. - Almeda : Sybex Inc., 1987. - 1029 pg. - ISBN 0-89588-301-5
Abstract: Data file structure and memo file structure for xBase
Clipper Programming Guide / Rick Spence. - 2.nd edition. - Microtrend Books, Slawson Communications, Inc. - ISBN 0-915391-41-4
Turbo C : Memory-resistent utilities, screen I/O and programming techniques / A. Stevens. - Portland, Origon, USA : MIS Press, 1987. - 10+315 pg. - ISBN 0-943518-35-0
Note: Video Windows and TSR utility programs
Mastering dBASE III : A Structured Approach / Carl Townsend. - Berkeley : Sybex Inc., 1985. - ISBN 0-89588-301-5
Abstract: Data file structure and index file structure for xBase
File formats for popular PC software : A programmer's reference / J. Walden. - New York, New York, USA : Wiley, 1986. - 16+287 pg. - ISBN 0-471-83671-0
Transactional Locking, Part 1 / Thomas Wang (wang@cup.hp.com)
URL: http://www.concentric.net/~Ttwang/tech/locks1.htm
Found at:
http://support.microsoft.com/support/kb/articles/q119/7/63.asp
It seems that Microsoft has removed that document.
Some dBASE Stuff / Gary White
This is my dBASE stuff. It ranges from old stuff for the DOS versions of dBASE to new stuff for Visual dBASE version 7. There's even some stuff that's non-version-specific. You'll also find links to some other very good sites. Don't forget the FAQ (Frequently Asked Questions), which is included in a site search.
URL: http://geocities.com/geoff_wass/dBASE/index.html
URL: http://www.sequiter.com/papers/wpcbase6.htm