Cita APA (7th ed.)

Hill, M. K. (1997). Understanding environmental pollution. Univ. Pr.

Cita Chicago (17th ed.)

Hill, Marquita K. Understanding Environmental Pollution. Cambridge: Univ. Pr, 1997.

Cita MLA (9th ed.)

Hill, Marquita K. Understanding Environmental Pollution. Univ. Pr, 1997.