Rubinstein, A. Z., & Thumn, G. W. (1965). The challenge of politics: Ideas and issues (2nd.ed.). Prentice Hall.

Rubinstein, Alvin Z., and Garold W. Thumn. The Challenge of Politics: Ideas and Issues. 2nd.ed. Englewood Cliffs: Prentice Hall, 1965.

Rubinstein, Alvin Z., and Garold W. Thumn. The Challenge of Politics: Ideas and Issues. 2nd.ed. Prentice Hall, 1965.