Dyfyniad APA

(1968). International encyclopedia of the social sciences. Volume 13, 14. Collier Macmillan Publishers.

Dyfyniad Arddull Chicago

International Encyclopedia of the Social Sciences. Volume 13, 14. New York: Collier Macmillan Publishers, 1968.

Dyfyniad MLA

International Encyclopedia of the Social Sciences. Volume 13, 14. Collier Macmillan Publishers, 1968.

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