Citazione APA

Derbyshire, J. D., & Derbyshire, I. (1996). Political systems of the world ([2nd ed.].). St. Martin's Press.

Stile di citazione Chicago

Derbyshire, J. Denis, e Ian Derbyshire. Political Systems of the World. [2nd ed.]. New York: St. Martin's Press, 1996.

Citazione MLA

Derbyshire, J. Denis, e Ian Derbyshire. Political Systems of the World. [2nd ed.]. St. Martin's Press, 1996.