Gaya APA
S., P, D. (2004).
Letters 121-150. Transl. by Owen J. Blum & Irven M. Resnick. .
Washington:
Washington Catholic University of America Press.
Gaya MLA
S., Petrus, Damianus,.
"Letters 121-150. Transl. by Owen J. Blum & Irven M. Resnick. ".
Washington:
Washington Catholic University of America Press,
2004.
Buku.