APA (7th ed.) Citation

Gale Group. (2009). Countries of the world and their leaders yearbook 2010. Gale.

Chicago Style (17th ed.) Citation

Gale Group. Countries of the World and Their Leaders Yearbook 2010. Detroit, Mich: Gale, 2009.

MLA (9th ed.) Citation

Gale Group. Countries of the World and Their Leaders Yearbook 2010. Gale, 2009.