Cita APA (7a ed.)

Peter Damian, S., & Blum, O. J. (1998). Letters 91-120. Catholic University of America.

Cita Chicago Style (17a ed.)

Peter Damian, Saint, y Owen J. Blum. Letters 91-120. Washington, D.C: Catholic University of America, 1998.

Cita MLA (8a ed.)

Peter Damian, Saint, y Owen J. Blum. Letters 91-120. Catholic University of America, 1998.