Cita APA (7a ed.)

Knowles, D. (1968). Peter has Spoken: The Encyclical Without ambiguity. Catholic Truth Society.

Cita Chicago Style (17a ed.)

Knowles, David. Peter Has Spoken: The Encyclical Without Ambiguity. London: Catholic Truth Society, 1968.

Cita MLA (9a ed.)

Knowles, David. Peter Has Spoken: The Encyclical Without Ambiguity. Catholic Truth Society, 1968.