Dyfyniad APA

Day, R. W. (2001). Soil testing manualprocedures, classiffication data, and sampling practices. McGraw-Hill.

Dyfyniad Arddull Chicago

Day, Robert W. Soil Testing Manualprocedures, Classiffication Data, and Sampling Practices. McGraw-Hill, 2001.

Dyfyniad MLA

Day, Robert W. Soil Testing Manualprocedures, Classiffication Data, and Sampling Practices. McGraw-Hill, 2001.

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