Dyfyniad APA

(1923). The World almanac and book of facts. Press Pub. Co. (The New York World).

Dyfyniad Arddull Chicago

The World Almanac and Book of Facts. New York: Press Pub. Co. (The New York World), 1923.

Dyfyniad MLA

The World Almanac and Book of Facts. Press Pub. Co. (The New York World), 1923.

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