Almond, G. A. 1., Dahl, R. A. 1., Deutsch, K. W. 1., Eckstein, H. 1., Eulau, H. 1., & Pool, I. d. S. 1. (1967). Contemporary political science: Toward empirical theory. New York: McGraw-Hill Book Company.

Almond, Gabriel Abraham 1911-2002, Robert Alan 1915-2014 Dahl, Karl Wolfgang 1912-1992 Deutsch, Harry 1920- Eckstein, Heinz 1915-2004 Eulau, and Ithiel de Sola 1917-1984 Pool. Contemporary Political Science: Toward Empirical Theory. New York: McGraw-Hill Book Company, 1967.

Almond, Gabriel Abraham 1911-2002, et al. Contemporary Political Science: Toward Empirical Theory. New York: McGraw-Hill Book Company, 1967.