Dyfyniad APA

Steel, E. W. (1960). Water supply and sewerage (4th ed.). McGraw-Hill.

Dyfyniad Arddull Chicago

Steel, Ernest. W. Water Supply and Sewerage. 4th ed. New York: McGraw-Hill, 1960.

Dyfyniad MLA

Steel, Ernest. W. Water Supply and Sewerage. 4th ed. McGraw-Hill, 1960.

Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.