Παραπομπή σε μορφή APA (7η εκδ.)

Peter, t. V., Martin, J., & Constable, G. (1974). Selected letters. Published for the Centre for Medieval Studies by the Pontifical Institute of Mediaeval Studies.

Παραπομπή σε μορφή Chicago (17η εκδ.)

Peter, the Venerable, Janet Martin, και Giles Constable. Selected Letters. Toronto: Published for the Centre for Medieval Studies by the Pontifical Institute of Mediaeval Studies, 1974.

Παραπομπή σε μορφή MLA (8th εκδ.)

Peter, the Venerable, et al. Selected Letters. Published for the Centre for Medieval Studies by the Pontifical Institute of Mediaeval Studies, 1974.