Dyfyniad APA

(2011). International who's who of authors and writers 2012 (27th ed.). Routledge.

Dyfyniad Arddull Chicago

International Who's Who of Authors and Writers 2012. 27th ed. U.K: Routledge, 2011.

Dyfyniad MLA

International Who's Who of Authors and Writers 2012. 27th ed. Routledge, 2011.

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