More specific information about copyright conventions and other writers' issues...
The Bowker Annual of Library and Book Trade Information
Sponsored by the Council of National Library Associations/New York: Bowker, 2004
Updated yearly, this volume covers copyright issues with an emphasis on libraries.
The Copyright Permission and Libel Handbook : A Step-By-Step Guide for Writers, Editors, and Publishers (Wiley Books for Writers)
Lloyd J. Jassin and Steven C. Schecter/New York: John Wiley & Sons, 1998
Explains copyright and libel issues in great detail.
The Writer's Legal Companion
Brad Bunnin and Peter Beren/Reading, Mass.: Perseus Books, 1998. 3rd Edition
The National Writers Union relies on this book as a basic reference.
The Chicago Manual of Style
Chicago, Ill.: The University of Chicago Press, 2003. 15th Edition
This style guide for writers and editors of books, scholarly manuscripts,
and magazine articles covers basic copyright issues for writers, editors, and publishers.
Stylebook and Briefing on Media Law: with Internet Guide and Glossary
New York: Associated Press, 2005. 39th Edition
Updated yearly, this guide to newspaper journalism style also covers
conventions regarding quoting material in news stories, and copyright issues involved with the AP itself.
The Pirates and the Mouse: Disney's War Against the Counterculture
Bob Levin/Seattle, WA.: Fantagraphics Books, 2003
A deliciously incisive description of copyright in action. A tour of copyright history and landmark U.S. judgements (pp. 85-90) finds
them to be vague and inconsistent, an unhelpful set of precedents
for assessing fair use of heavily protected works and the social
assumptions they embody.
Brand Name Bullies: the Quest to Own and Control Culture
David Bollier/Hoboken, N.J.: John Wiley & Sons, 2005
Details the ways in which the free "cultural conversation" of creativity is being strangled by recent changes in copyright law, copyright rulings, and the ever more literal and inclusive claims of corporate copyright-holders.