Gaya APA

Wynn, W. (1988). Keepers of the keys. John XXIII, Paul VI and John Paul II: three who changed the Church. . New York: Random House.

Gaya MLA

Wynn, Wilton. "Keepers of the keys. John XXIII, Paul VI and John Paul II: three who changed the Church. ". New York: Random House, 1988. Buku.