Cita APA (7th ed.)

National Geographic Society, Washington, D.C. Special Publications Division. (1973). Primitive worlds: People lost in time. National Geographic Society.

Cita Chicago (17th ed.)

National Geographic Society, Washington, D.C. Special Publications Division. Primitive Worlds: People Lost in Time. Washington: National Geographic Society, 1973.

Cita MLA (9th ed.)

National Geographic Society, Washington, D.C. Special Publications Division. Primitive Worlds: People Lost in Time. National Geographic Society, 1973.