APA (7th ed.) Citation

Slud, P. (1964). The birds of Costa Rica: Distribution and ecology. [publisher not identified].

Chicago Style (17th ed.) Citation

Slud, Paul. The Birds of Costa Rica: Distribution and Ecology. New York: [publisher not identified], 1964.

MLA (9th ed.) Citation

Slud, Paul. The Birds of Costa Rica: Distribution and Ecology. [publisher not identified], 1964.