Dyfyniad APA

United Nations Industrial Development Organization. (1972). The manufacture and utilizatin of portland cement. New York: United Nations.

Dyfyniad Arddull Chicago

United Nations Industrial Development Organization. The Manufacture and Utilizatin of Portland Cement. New York: United Nations, 1972.

Dyfyniad MLA

United Nations Industrial Development Organization. The Manufacture and Utilizatin of Portland Cement. New York: United Nations, 1972.

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