Dyfyniad APA

(1981). An Environmental bibliography: Publications issued by unep or under its auspices 1973-1980. United Nations Environment Programme.

Dyfyniad Arddull Chicago

An Environmental Bibliography: Publications Issued by Unep or Under Its Auspices 1973-1980. Nairobi: United Nations Environment Programme, 1981.

Dyfyniad MLA

An Environmental Bibliography: Publications Issued by Unep or Under Its Auspices 1973-1980. United Nations Environment Programme, 1981.

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