Dyfyniad APA

(2007).  The World almanac book of records: Firsts, feats, facts & phenomena.  World Almanac Books.

Dyfyniad Arddull Chicago

 The World Almanac Book of Records: Firsts, Feats, Facts & Phenomena.  World Almanac Books, 2007.

Dyfyniad MLA

 The World Almanac Book of Records: Firsts, Feats, Facts & Phenomena.  World Almanac Books, 2007.

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