Carr, R. K., Bernstein, M. H., Morrison, D. H., & McLean, J. E. (1959). American democracy in theory and practice: National, state, and local government (3a. ed.). Holt, Rinehart and Winston.

Carr, Robert K., Marver H. Bernstein, Donald H. Morrison, and Joseph E. McLean. American Democracy in Theory and Practice: National, State, and Local Government. 3a. ed. Nueva York: Holt, Rinehart and Winston, 1959.

Carr, Robert K., et al. American Democracy in Theory and Practice: National, State, and Local Government. 3a. ed. Holt, Rinehart and Winston, 1959.