APA

Bryan C. D. B., . (1987). The National Geographic Society: 100 years of adventure and discovery. New York: H.N. Abrams.

Chicago

Bryan C D B, . 1987. The National Geographic Society: 100 years of adventure and discovery. New York: H.N. Abrams.

Harvard

Bryan C. D. B., . (1987). The National Geographic Society: 100 years of adventure and discovery. New York: H.N. Abrams.

MLA

Bryan C D B, . The National Geographic Society: 100 years of adventure and discovery. New York: H.N. Abrams. 1987.