(1968). Vanishing peoples of the earth. Washington DC: National Geographic Society.
Чикагска система за цитиранеVanishing Peoples of the Earth. Washington DC: National Geographic Society, 1968.
MLA формат за цитиранеVanishing Peoples of the Earth. Washington DC: National Geographic Society, 1968.
Внимание: Тези цитати може да не са 100% точни.