Cita APA (7a ed.)
Garret, W. E. National Geographic: Vol. 175, no. 4, April 1989. National Geographic Society.
Cita estilo Chicago (17a ed.)
Garret, Wilbur E. National Geographic: Vol. 175, No. 4, April 1989. Washington, EUA: National Geographic Society.
Cita MLA (9a ed.)
Garret, Wilbur E. National Geographic: Vol. 175, No. 4, April 1989. National Geographic Society.
אזהרה: ציטוטים אלה לעיתים לא מדויקים ב 100%.