The CGI specification: http://hoohoo.ncsa.uiuc.edu/cgi/
The HTTP/1.1 standard: http://www.w3.org/Protocols/rfc2616/rfc2616.html
Various information about CGI at the W3C site: http://www.w3.org/CGI/
MIME Media Types: http://www.ietf.org/rfc/rfc2046.txt
The Apache Modules Registry: http://modules.apache.org/
Writing Apache Modules with Perl and C, by Lincoln Stein and Doug MacEachern (O'Reilly); selected chapters available online at http://www.modperl.com/
mod_perl Developer's Cookbook, by Geoffrey Young, Paul Lindner, and Randy Kobes (Sams Publishing); selected chapters available online at http://www.modperlcookbook.org/.
CGI Programming with Perl, by Scott Guelich, Shishir Gundavaram, Gunther Birznieks (O'Reilly)
Copyright © 2003 O'Reilly & Associates. All rights reserved.