Cita APA (7a ed.)
Allen, W. L. National Geographic: Vol. 194, no. 6, December 1998. National Geographic Society.
Cita estilo Chicago (17a ed.)
Allen, William L. National Geographic: Vol. 194, No. 6, December 1998. Washington, EUA: National Geographic Society.
Cita MLA (9a ed.)
Allen, William L. National Geographic: Vol. 194, No. 6, December 1998. National Geographic Society.
אזהרה: ציטוטים אלה לעיתים לא מדויקים ב 100%.