Dyfyniad APA

Bennett. (1955). Elements of soil conservation (2.). Mc Graw Hill Book company.

Dyfyniad Arddull Chicago

Bennett. Elements of Soil Conservation. 2. NewYork: Mc Graw Hill Book company, 1955.

Dyfyniad MLA

Bennett. Elements of Soil Conservation. 2. Mc Graw Hill Book company, 1955.

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