APA

Watt K. E., . (1968). Ecology and resource management. New York: McGraw-Hill.

Chicago

Watt Kenneth E.F, . 1968. Ecology and resource management. New York: McGraw-Hill.

Harvard

Watt K. E., . (1968). Ecology and resource management. New York: McGraw-Hill.

MLA

Watt Kenneth E.F, . Ecology and resource management. New York: McGraw-Hill. 1968.