APA (7e ed.) Bronvermelding

Somerville, R. (1990). Papacy, councils, and canon law in the 11th-12th centuries. Variorum.

Chicago (17e ed.) Bronvermelding

Somerville, Robert. Papacy, Councils, and Canon Law in the 11th-12th Centuries. Aldershot: Variorum, 1990.

MLA (8e ed.) Bronvermelding

Somerville, Robert. Papacy, Councils, and Canon Law in the 11th-12th Centuries. Variorum, 1990.