APA (7th ed.) Citation

Beckwith, C., Fisher, A., & Hancock, G. (1990). African ark: People and ancient cultures of Ethiopia and the Horn of Africa. H.N. Abrams.

Chicago Style (17th ed.) Citation

Beckwith, Carol, Angela Fisher, and Graham Hancock. African Ark: People and Ancient Cultures of Ethiopia and the Horn of Africa. New York: H.N. Abrams, 1990.

MLA (9th ed.) Citation

Beckwith, Carol, et al. African Ark: People and Ancient Cultures of Ethiopia and the Horn of Africa. H.N. Abrams, 1990.