Willis, B. (1930). Living Africa: A geologist's wanderings through the rift valleys. Whittlesey House, McGraw-Hill.
Citace podle Chicago (17th ed.)Willis, Bailey. Living Africa: A Geologist's Wanderings Through the Rift Valleys. [New York]: Whittlesey House, McGraw-Hill, 1930.
Citace podle MLA (8th ed.)Willis, Bailey. Living Africa: A Geologist's Wanderings Through the Rift Valleys. Whittlesey House, McGraw-Hill, 1930.
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