Dyfyniad APA

(1969). Catalog of books 1969. New York: Litton Educational Publishing.

Dyfyniad Arddull Chicago

Catalog of Books 1969. New York: Litton Educational Publishing, 1969.

Dyfyniad MLA

Catalog of Books 1969. New York: Litton Educational Publishing, 1969.

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