Cita APA (7th ed.)

Hill, M. (2004). understanding environmental pollution (2nd.). CUP.

Cita Chicago (17th ed.)

Hill, Marquita. Understanding Environmental Pollution. 2nd. Cambridge: CUP, 2004.

Cita MLA (9th ed.)

Hill, Marquita. Understanding Environmental Pollution. 2nd. CUP, 2004.