Dyfyniad APA
Sawyer, C. N., McCarty, P. L., & Parkin, G. F. (1994). Chemistry for environmental engineering (4th ed.). McGraw-Hill.
Dyfyniad Arddull Chicago
Sawyer, Clair N., Perry L. McCarty, and Gene F. Parkin. Chemistry for Environmental Engineering. 4th ed. New York: McGraw-Hill, 1994.
Dyfyniad MLA
Sawyer, Clair N., et al. Chemistry for Environmental Engineering. 4th ed. McGraw-Hill, 1994.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.