APA (7th ed.) Zitazioa

Derbyshire, J. D., & Derbyshire, I. (1989). Chambers political systems of the world. Chambers.

Chicago Style (17th ed.) Zitazioa

Derbyshire, J. Denis, eta Ian Derbyshire. Chambers Political Systems of the World. Edinburgh: Chambers, 1989.

MLA (9th ed.) Zitazioa

Derbyshire, J. Denis, eta Ian Derbyshire. Chambers Political Systems of the World. Chambers, 1989.