Cita APA

Watt, K. E. F. 1., Young, J. R., & First, C. (1973). Principles of environmental science. New York: McGraw-Hill Book Company.

Citación estilo Chicago

Watt, Kenneth E. F. 1929-, James R. Young, y Carol First. Principles of Environmental Science. New York: McGraw-Hill Book Company, 1973.

Cita MLA

Watt, Kenneth E. F. 1929-, James R. Young, y Carol First. Principles of Environmental Science. New York: McGraw-Hill Book Company, 1973.