Dyfyniad APA

(2002). Countries of the world and their leaders yearbook, 2003. Gale Group.

Dyfyniad Arddull Chicago

Countries of the World and Their Leaders Yearbook, 2003. Farmington Hills, Mich: Gale Group, 2002.

Dyfyniad MLA

Countries of the World and Their Leaders Yearbook, 2003. Gale Group, 2002.

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