APA

Beebe S. B., . (1986). The international program. New York-US: The nature conservancy.

Chicago

Beebe Spencer B, . 1986. The international program. New York-US: The nature conservancy.

Harvard

Beebe S. B., . (1986). The international program. New York-US: The nature conservancy.

MLA

Beebe Spencer B, . The international program. New York-US: The nature conservancy. 1986.