MLA

Tyrrell, George. Lex Credendi; : a Sequel to Lex Orandi. New York: Longmans, Green, and co., 1906.

APA

Tyrrell, G. (1906). Lex credendi; : a sequel to Lex orandi. New York: Longmans, Green, and co.

Chicago

Tyrrell, George, Lex Credendi;: A Sequel to Lex Orandi,. New York: Longmans, Green, and co., 1906.