APA (7th ed.) Citation

Gray, N. F. (1990). Activated sludge: Theory and practice. Oxford University Press.

Chicago Style (17th ed.) Citation

Gray, N. F. Activated Sludge: Theory and Practice. Oxford ; New York: Oxford University Press, 1990.

MLA (9th ed.) Citation

Gray, N. F. Activated Sludge: Theory and Practice. Oxford University Press, 1990.

Warning: These citations may not always be 100% accurate.