APA

Butler D., Ranney A. & Penniman H. R. (1981). Democracy at the polls: a comparative study of competitive national elections. Washington, D.C: American Enterprise Institute for Public Policy Research.

Chicago

Butler David, Ranney Austin and Penniman Howard Rae. 1981. Democracy at the polls: a comparative study of competitive national elections. Washington, D.C: American Enterprise Institute for Public Policy Research.

Harvard

Butler D., Ranney A. and Penniman H. R. (1981). Democracy at the polls: a comparative study of competitive national elections. Washington, D.C: American Enterprise Institute for Public Policy Research.

MLA

Butler David, Ranney Austin and Penniman Howard Rae. Democracy at the polls: a comparative study of competitive national elections. Washington, D.C: American Enterprise Institute for Public Policy Research. 1981.