Cita APA (7a ed.)

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

Cita Chicago Style (17a ed.)

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

Cita MLA (9a ed.)

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