The Road to Xenu - A narrative account of life in Scientology by Margery Wakefield. - http://www.cs.cmu.edu/~dst/Fishman/Xenu/xenu.html
Examining the Church of Scientology: Books - Online library of books (in PDF format) critical of Scientology. From Apologetics Index. - http://www.apologeticsindex.org/s04b.html
The Scandal of Scientology - The full book by Paulette Cooper as well as the battles after it was published. - http://www.clambake.org/archive/books/tsos/sos.html
Believe What You Like - Complete text of 1973 book by the late C.H. Rolph examines the origins of Scientology, the skirmishes of Scientologists with the law in the U.K., and their aborted attempt to infiltrate the National Association for Mental Health. - http://www.religio.de/books/chr/chr.htm
Secret Library of Scientology - A library for the critical study of Scientology. - http://www.cs.cmu.edu/~dst/Library/