Holtzman, A. (1966). Interest groups and lobbyng. The MacMillan.
Chicago Style aipamenaHoltzman, Abraham. Interest Groups and Lobbyng. New York: The MacMillan, 1966.
MLA aipamenaHoltzman, Abraham. Interest Groups and Lobbyng. The MacMillan, 1966.
Kontuz: berrikusi erreferentzia hauek erabili aurretik.