Gais, T. (1996). Improper influence: Campaign finance law, political interest groups, and the problem of equality. University of Michigan Press.

Gais, Thomas. Improper Influence: Campaign Finance Law, Political Interest Groups, and the Problem of Equality. Ann Arbor: University of Michigan Press, 1996.

Gais, Thomas. Improper Influence: Campaign Finance Law, Political Interest Groups, and the Problem of Equality. University of Michigan Press, 1996.