APA (7th ed.) Citation

Grosvenor, G. M. (1973). Primitive Worlds: People Lost In Time. National Geographic Society.

Chicago Style (17th ed.) Citation

Grosvenor, Gilbert M. Primitive Worlds: People Lost In Time. National Geographic Society, 1973.

MLA (8th ed.) Citation

Grosvenor, Gilbert M. Primitive Worlds: People Lost In Time. National Geographic Society, 1973.

Warning: These citations may not always be 100% accurate.