Cita APA (7th ed.)

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

Cita Chicago (17th ed.)

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

Cita MLA (9th ed.)

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