Dyfyniad APA
Walton, W. C. (1970). Groundwater resource evaluation. McGraw-Hill.
Dyfyniad Arddull Chicago
Walton, William Clarence. Groundwater Resource Evaluation. New York: McGraw-Hill, 1970.
Dyfyniad MLA
Walton, William Clarence. Groundwater Resource Evaluation. McGraw-Hill, 1970.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.