APA

Perry R., . (1972). The Galápagos Islands. New York: Dodd, Mead and Co.

Chicago

Perry Roger, . 1972. The Galápagos Islands. New York: Dodd, Mead and Co.

Harvard

Perry R., . (1972). The Galápagos Islands. New York: Dodd, Mead and Co.

MLA

Perry Roger, . The Galápagos Islands. New York: Dodd, Mead and Co. 1972.