Cita APA (7a ed.)

Peter Damian, S., & Blum, O. J. (1990). Letters. Catholic University of America Press.

Cita Chicago Style (17a ed.)

Peter Damian, Saint, y Owen J. Blum. Letters. Washington, D.C: Catholic University of America Press, 1990.

Cita MLA (8a ed.)

Peter Damian, Saint, y Owen J. Blum. Letters. Catholic University of America Press, 1990.