Παραπομπή σε μορφή APA (7η εκδ.)

National Geographic Society. (1978). The heart of the Grand Canyon: / Grand Canyon Park, Arizona. National Geographic Magazine.

Παραπομπή σε μορφή Chicago (17η εκδ.)

National Geographic Society. The Heart of the Grand Canyon: / Grand Canyon Park, Arizona. Washigton, Estados Unidos: National Geographic Magazine, 1978.

Παραπομπή σε μορφή MLA (9th εκδ.)

National Geographic Society. The Heart of the Grand Canyon: / Grand Canyon Park, Arizona. National Geographic Magazine, 1978.