Dyfyniad APA

(2010). The world almanac and book of facts 2010. World Almanac Books.

Dyfyniad Arddull Chicago

The World Almanac and Book of Facts 2010. New York: World Almanac Books, 2010.

Dyfyniad MLA

The World Almanac and Book of Facts 2010. World Almanac Books, 2010.

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