Sawyer , C. N., McCarty , P. L., & Parkin , G. F. (1994). Chemistry for environmental engineering (4th ed.). McGraw - hill.

Sawyer , Clair N., Perry L. McCarty , and Gene F. Parkin. Chemistry for Environmental Engineering. 4th ed. New York: McGraw - hill, 1994.

Sawyer , Clair N., et al. Chemistry for Environmental Engineering. 4th ed. McGraw - hill, 1994.