Reference Books:

100 Banned Books: Censorship Histories of World Literature REF  Z658 .U5 .K35 1999
Banned Books: 387 B.C. to 1978 A.D. Ref  Z1019 .H15 1978
Encyclopedia of Censorship REF 657 .G73 2005
The Whole Library Handbook REF Z665.2 .U6 E243

 

Websites:

Newsletter on Intellectual Freedom

https://members.ala.org/nif/ (has Sept. 2002-May 2007). No search feature available, but you can browse through the issues.

Wofford College has a subscription to this newsletter starting from 1989. 

 

Banned Books Week from ALA

http://www.ala.org/ala/oif/bannedbooksweek/challengedbanned/challengedbanned.htm

 

Databases:

NetLibrary eBooks
 

Do a full-text search for your book and narrow it by adding a word such as banned, challenged, prohibited, etc:

For example:
"gone with the wind" and banned
"gone with the wind" and challenged

Suggested subject terms:
eBooks has several good books on this topic that can be found using the following subjects-

Censorship--United States
Public Libraries--Censorship--United States
Prohibited books
Challenged books

Gale Databases and Academic Search Premier:

Do a keyword search for your book and narrow it by adding a word such as banned, challenged, prohibited, etc:

Examples:
"huckleberry finn" and banned
"huckleberry finn" and challenged

Once you find the name of someone who has challenged the book, or a place the book has been challenged, you can do a keyword or  full-text search for your book and the name of the challenger or place being challenged to see if you can find more articles on that particular challenge.
 

Examples:
"Huckleberry Finn" and "kathy monteiro"
"Huckleberry Finn" and "mcclintock high school"
 

Gale Databases suggested subject Term: Banned books

Academic Search premiere suggested subject term: Prohibited books
 

LexisNexis
This is a more complicated source to use, but allows you search newspapers from all over the United States. See the screenshot below for tips on how to search this database.