Cita APA (7a ed.)

John Paul II, P. (1987). On the twelfth centenary of the second council of Nicaea: Duodecimum saeculum : apostolic letter, December 4, 1987. Washington, D.C..

Cita Chicago Style (17a ed.)

John Paul II, Pope. On the Twelfth Centenary of the Second Council of Nicaea: Duodecimum Saeculum : Apostolic Letter, December 4, 1987. Washington, D.C., 1987.

Cita MLA (8a ed.)

John Paul II, Pope. On the Twelfth Centenary of the Second Council of Nicaea: Duodecimum Saeculum : Apostolic Letter, December 4, 1987. Washington, D.C., 1987.