Cita APA (7a ed.)

Graham, R. A., & Krol, J. (1968). The Pope and Poland in World War Two. Veritas.

Cita Chicago Style (17a ed.)

Graham, Robert A., y John Krol. The Pope and Poland in World War Two. London: Veritas, 1968.

Cita MLA (9a ed.)

Graham, Robert A., y John Krol. The Pope and Poland in World War Two. Veritas, 1968.