Cytowanie według stylu APA (wyd. 7)

Willis, G. G. (1994). A history of early Roman liturgy to the death of Pope Gregory the Great. published for the Henry Bradshaw Society, Boydell Press.

Cytowanie według stylu Chicago (wyd. 17)

Willis, Geoffrey Grimshaw. A History of Early Roman Liturgy to the Death of Pope Gregory the Great. London ; Rochester, N.Y., USA: published for the Henry Bradshaw Society, Boydell Press, 1994.

Cytowanie według stylu MLA (wyd. 8)

Willis, Geoffrey Grimshaw. A History of Early Roman Liturgy to the Death of Pope Gregory the Great. published for the Henry Bradshaw Society, Boydell Press, 1994.