Dyfyniad APA

(1969). Yearbook of International Organizations. Belgium: Union of International Associations.

Dyfyniad Arddull Chicago

Yearbook of International Organizations. Belgium: Union of International Associations, 1969.

Dyfyniad MLA

Yearbook of International Organizations. Belgium: Union of International Associations, 1969.

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