APA

Butler D., Penniman H. R., Ranney A. & American Enterprise Institute for Public Polici Research. (1981). Democracy at the polls. Washington: American Enterprise Institute for Public Policy Research.

Chicago

Butler David, Penniman Howard R, Ranney Austin and American Enterprise Institute for Public Polici Research. 1981. Democracy at the polls. Washington: American Enterprise Institute for Public Policy Research.

Harvard

Butler D., Penniman H. R., Ranney A. and American Enterprise Institute for Public Polici Research. (1981). Democracy at the polls. Washington: American Enterprise Institute for Public Policy Research.

MLA

Butler David, Penniman Howard R, Ranney Austin and American Enterprise Institute for Public Polici Research. Democracy at the polls. Washington: American Enterprise Institute for Public Policy Research. 1981.