Cita APA (7a ed.)

Watkins, O. D. (1920). A history of penance: Being a study of the authorities. Longmans, Green and Co.

Cita Chicago Style (17a ed.)

Watkins, Oscar D. A History of Penance: Being a Study of the Authorities. London ; New York: Longmans, Green and Co, 1920.

Cita MLA (9a ed.)

Watkins, Oscar D. A History of Penance: Being a Study of the Authorities. Longmans, Green and Co, 1920.