Singh, R. (2003). American government and politics: A concise introduction. SAGE Publications.
Lua i Stíl Chicago (17ú heag.)Singh, Robert. American Government and Politics: A Concise Introduction. London ; Thousand Oaks, Calif.: SAGE Publications, 2003.
Lua MLA (9ú heag.)Singh, Robert. American Government and Politics: A Concise Introduction. SAGE Publications, 2003.
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