APA (7th ed.) Citation

Von Hagen, V. W. (1949). Ecuador and the Galapagos Islands ([1st ed.].). University of Oklahoma Press.

Chicago Style (17th ed.) Citation

Von Hagen, Victor Wolfgang. Ecuador and the Galapagos Islands. [1st ed.]. Norman: University of Oklahoma Press, 1949.

MLA (9th ed.) Citation

Von Hagen, Victor Wolfgang. Ecuador and the Galapagos Islands. [1st ed.]. University of Oklahoma Press, 1949.