Cavolina, Jane, ed.The Pope Encyclopedia: An A to Z of the Holy See. Crown, 1995. Contains more than 2,000 entries in an easy-to-use alphabetical format; explores the history of the Vatican and its rulers.
Attridge, Harold W.; Theodore M. Hesburgh; and Richard P. McBrien, eds.The Encyclopedia of Catholicism. HarperCollins, 1995. More than 4,200 entries by 280 contributors, with tables of the liturgical calendar, ecumenical councils, and the popes.
Gillis, Chester.Roman Catholicism in America. Columbia University Press, 2000. A broad survey of American Catholicism and the persistent tension with Rome.