Παραπομπή σε μορφή APA (7η εκδ.)

John XXIII, P. (1959). A letter from His Holiness, Pope John XXIII. Servants of the Holy Paraclete.

Παραπομπή σε μορφή Chicago (17η εκδ.)

John XXIII, Pope. A Letter from His Holiness, Pope John XXIII. Randolph, Vt.: Servants of the Holy Paraclete, 1959.

Παραπομπή σε μορφή MLA (8th εκδ.)

John XXIII, Pope. A Letter from His Holiness, Pope John XXIII. Servants of the Holy Paraclete, 1959.