APA

Boulenger G. A., . (1961). Catalogue of the snakes in the British Museum (Natural History). New York: J. Cramer.

Chicago

Boulenger George Albert, . 1961. Catalogue of the snakes in the British Museum (Natural History). New York: J. Cramer.

Harvard

Boulenger G. A., . (1961). Catalogue of the snakes in the British Museum (Natural History). New York: J. Cramer.

MLA

Boulenger George Albert, . Catalogue of the snakes in the British Museum (Natural History). New York: J. Cramer. 1961.