APA

Schlager N., Weisblatt J. & Pérez O. J. (2006). World encyclopedia of political systems and parties. New York: Facts on file.

Chicago

Schlager Neil, Weisblatt Jayne and Pérez Orlando J. 2006. World encyclopedia of political systems and parties. New York: Facts on file.

Harvard

Schlager N., Weisblatt J. and Pérez O. J. (2006). World encyclopedia of political systems and parties. New York: Facts on file.

MLA

Schlager Neil, Weisblatt Jayne and Pérez Orlando J. World encyclopedia of political systems and parties. New York: Facts on file. 2006.