The Reference Shelf, vol. H.W. Wilson, 1990. The Encyclopedia of Censorship, by Jonathon Green. The Reference Shelf, vol. The Bowker Annual Library and Book Trade Almanac.
Emphasis is on the rationale and theory of censorship.
Discusses the role of the Catholic Church in censorship. 1983 vol., p. 485. This library database indexes over 2000 general interest and academic journals. Nearly 1000 periodicals are full-text. Dates vary, but many full-text journals go back to 1988.