Hughes, B. B. (1997). Continuity and chance in world politics: Competing perspectives (3rd ed.). Prentice Hall.
Lua i Stíl Chicago (17ú heag.)Hughes, Barry B. Continuity and Chance in World Politics: Competing Perspectives. 3rd ed. New Jersey: Prentice Hall, 1997.
Lua MLA (9ú heag.)Hughes, Barry B. Continuity and Chance in World Politics: Competing Perspectives. 3rd ed. Prentice Hall, 1997.
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