Johannes Paulus II. (1980). To serve peace, respect freedom: World Day of Peace message for 1981. Origins, 10, .
Cita Chicago Style (17a ed.)Johannes Paulus II. "To Serve Peace, Respect Freedom: World Day of Peace Message for 1981." Origins 10 (1980).
Cita MLA (8a ed.)Johannes Paulus II. "To Serve Peace, Respect Freedom: World Day of Peace Message for 1981." Origins, vol. 10, 1980.
Precaución: Estas citas no son 100% exactas.