Cita APA (7th ed.)

Freedman, B. (1998). Environmental science: A Canadian perspective. Prentice Hall.

Cita Chicago (17th ed.)

Freedman, Bill. Environmental Science: A Canadian Perspective. Scarborough, Ont: Prentice Hall, 1998.

Cita MLA (9th ed.)

Freedman, Bill. Environmental Science: A Canadian Perspective. Prentice Hall, 1998.