Dyfyniad APA

(2004). The world almanac and book of facts 2004. New York: World almanac books.

Dyfyniad Arddull Chicago

The World Almanac and Book of Facts 2004. New York: World almanac books, 2004.

Dyfyniad MLA

The World Almanac and Book of Facts 2004. New York: World almanac books, 2004.

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