Cita APA

Watt, K. E. F. 1. (1973). Principles of evironmental science. New York: McGraw-Hill.

Citación estilo Chicago

Watt, Kenneth E. F. 1929-. Principles of Evironmental Science. New York: McGraw-Hill, 1973.

Cita MLA

Watt, Kenneth E. F. 1929-. Principles of Evironmental Science. New York: McGraw-Hill, 1973.