Cita APA (7a ed.)

Watt, K. E. F. (1973). Principles of environmental science. McGraw-Hill.

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

Watt, Kenneth E. F. Principles of Environmental Science. McGraw-Hill, 1973.