Dyfyniad APA

(1999). United Nations conference on trade and development: Handbook of world mineral trade statistics 1991 - 1996. New York: United Nations.

Dyfyniad Arddull Chicago

United Nations Conference On Trade and Development: Handbook of World Mineral Trade Statistics 1991 - 1996. New York: United Nations, 1999.

Dyfyniad MLA

United Nations Conference On Trade and Development: Handbook of World Mineral Trade Statistics 1991 - 1996. New York: United Nations, 1999.

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