Dyfyniad APA

Knowles, R. (1981). Economic and Social Geography (Fourth Edition). ELSEVIER.

Dyfyniad Arddull Chicago

Knowles, R. Economic and Social Geography (Fourth Edition). ELSEVIER, 1981.

Dyfyniad MLA

Knowles, R. Economic and Social Geography (Fourth Edition). ELSEVIER, 1981.

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