Cita APA (7a ed.)
Washburn, B., & Washburn, B. P. (1978). The Heart of the Grand Canyon. National Geographic Society : Museum of Science.
Cita estilo Chicago (17a ed.)
Washburn, Bradford, y Barbara P. Washburn. The Heart of the Grand Canyon. Washington, EUA : Boston, EUA: National Geographic Society : Museum of Science, 1978.
Cita MLA (9a ed.)
Washburn, Bradford, y Barbara P. Washburn. The Heart of the Grand Canyon. National Geographic Society : Museum of Science, 1978.
אזהרה: ציטוטים אלה לעיתים לא מדויקים ב 100%.