Zeigler, H. L., & Peak, W. G. (1972). Interest groups in American society (2nd ed.). Prentice hall.
Chicago Edition CitationZeigler, Harmon L., and Wayne G. Peak. Interest Groups in American Society. 2nd ed. New Jersey: Prentice hall, 1972.
Deismireacht MLAZeigler, Harmon L., and Wayne G. Peak. Interest Groups in American Society. 2nd ed. Prentice hall, 1972.
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