Bowler, S., Blais, A., & Grofman, B. (2009). Duverger's Law of Plurality Voting: The Logic of Party Competition in Canada, India, the United Kingdom and the United States. Springer New York. https://doi.org/10.1007/978-0-387-09720-6

Bowler, Shaun, Andr Blais, juo Bernard Grofman. Duverger's Law of Plurality Voting: The Logic of Party Competition in Canada, India, the United Kingdom and the United States. New York, NY: Springer New York, 2009. https://doi.org/10.1007/978-0-387-09720-6.

Bowler, Shaun, et al. Duverger's Law of Plurality Voting: The Logic of Party Competition in Canada, India, the United Kingdom and the United States. Springer New York, 2009. https://doi.org/10.1007/978-0-387-09720-6.