Macridis, R. C., & Ward, R. E. (1972). Modern political systems. (3d ed.). Prentice-Hall.
Chicago-čujuhus (17. p.)Macridis, Roy C., juo Robert Edward Ward. Modern Political Systems. 3d ed. Englewood Cliffs, N.J.: Prentice-Hall, 1972.
MLA-čujuhus (9. p.)Macridis, Roy C., juo Robert Edward Ward. Modern Political Systems. 3d ed. Prentice-Hall, 1972.
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