Dyfyniad APA
Peavy, H. S., Rowe, D. R., & Tchobanoglous, G. (1985). Environmental engineering. McGraw-Hill.
Dyfyniad Arddull Chicago
Peavy, Howard S., Donald R. Rowe, and George Tchobanoglous. Environmental Engineering. New York: McGraw-Hill, 1985.
Dyfyniad MLA
Peavy, Howard S., et al. Environmental Engineering. McGraw-Hill, 1985.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.