APA Style

Lijphart, A., Aitkin, D. (1994). Electoral systems and party systems: a study of twenty-seven democracies, 1945-1990 . Oxford: Oxford University Press.

MLA Style

Lijphart, Arend.., Aitkin, Don.. "Electoral systems and party systems: a study of twenty-seven democracies, 1945-1990". Oxford: Oxford University Press, 1994. Books.