Macridis, R. C. (1963). Europe: Modern political systems. Prentice-Hall.
Lua i Stíl Chicago (17ú heag.)Macridis, Roy C. Europe: Modern Political Systems. Englewood Cliffs: Prentice-Hall, 1963.
Lua MLA (9ú heag.)Macridis, Roy C. Europe: Modern Political Systems. Prentice-Hall, 1963.
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