Cita APA (7a ed.)
National Wildlife Federation. (2002). National wildlife (World ed.). National Wildlife Federation.
Cita Chicago Style (17a ed.)
National Wildlife Federation. National Wildlife. World ed. Reston, Va.: National Wildlife Federation, 2002.
Cita MLA (9a ed.)
National Wildlife Federation. National Wildlife. World ed. National Wildlife Federation, 2002.
Precaución: Estas citas no son 100% exactas.