Holtzman, A. (1966). Interest groups and lobbyng. The MacMillan.
Cita Chicago (17th ed.)Holtzman, Abraham. Interest Groups and Lobbyng. New York: The MacMillan, 1966.
Cita MLA (9th ed.)Holtzman, Abraham. Interest Groups and Lobbyng. The MacMillan, 1966.
Atenció: Aquestes cites poden no estar 100% correctes.