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Roy, A., & Bhattacharya, M. (1989). Political theory: Ideas and institutions (11th rev.ed.). Calcutta: World press.

Roy, Amal, and Mohit Bhattacharya. Political Theory: Ideas and Institutions. 11th rev.ed. Calcutta: World press, 1989.

Roy, Amal, and Mohit Bhattacharya. Political Theory: Ideas and Institutions. 11th rev.ed. Calcutta: World press, 1989.