Cita APA (7a ed.)

Petrus Venerabilis, 1., & Constable, G. (1967). The letters of Peter the Venerable. Harvard University Press.

Cita Chicago Style (17a ed.)

Petrus Venerabilis, 1092?-1156, y Giles Constable. The Letters of Peter the Venerable. Cambridge (Massachusetts): Harvard University Press, 1967.

Cita MLA (9a ed.)

Petrus Venerabilis, 1092?-1156, y Giles Constable. The Letters of Peter the Venerable. Harvard University Press, 1967.