APA Edition Citation

Derbyshire, J. D. D. (1999). Political systems of the world. Helicon Publishers.

Chicago Edition Citation

Derbyshire, J Denis Derbyshire. Political Systems of the World. Oxford: Helicon Publishers, 1999.

MLA Edition Citation

Derbyshire, J Denis Derbyshire. Political Systems of the World. Helicon Publishers, 1999.

Warning: These citations may not always be 100% accurate.