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Gereja Katolik Roma Lama di Eropa

The Old Catholic Church: A History and Chronology (The Autocephalous Orthodox Churches, No. 3). Karl Pruter. Highlandville, Missouri: St. Willibrord's Press, 1996.

The Old Catholic Sourcebook (Garland Reference Library of Social Science). Karl Pruter and J. Gordon Melton. New York: Garland Publishers, 1983.

The Old Catholic Churches and Anglican Orders. C.B. Moss. The Christian East, January, 1926.

The Old Catholic Movement. C.B. Moss. London: Society for Promoting Christian Knowledge, 1964.