HAMMER, D. P. (1990). The USSR: The politics of oligarchy. Westview.
Lua i Stíl Chicago (17ú heag.)HAMMER, Darrell P. The USSR: The Politics of Oligarchy. Boulder: Westview, 1990.
Lua MLA (9ú heag.)HAMMER, Darrell P. The USSR: The Politics of Oligarchy. Westview, 1990.
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