Cita APA (7th ed.)

Gray, N. (1989). Biology of wastewater treatment. Oxford University Press.

Cita Chicago (17th ed.)

Gray, N.F. Biology of Wastewater Treatment. Oxford, England: Oxford University Press, 1989.

Cita MLA (9th ed.)

Gray, N.F. Biology of Wastewater Treatment. Oxford University Press, 1989.