Cita APA (7th ed.)

Butler, D. E. (1963). The Electoral system in Britain since 1918 (2nd ed.). Clarendon.

Cita Chicago (17th ed.)

Butler, D. E. The Electoral System in Britain Since 1918. 2nd ed. Oxford: Clarendon, 1963.

Cita MLA (9th ed.)

Butler, D. E. The Electoral System in Britain Since 1918. 2nd ed. Clarendon, 1963.