Singh, R. (2003). American government and politics: A concise introduction. SAGE Publications.
芝加哥风格引文Singh, Robert. American Government and Politics: A Concise Introduction. London ; Thousand Oaks, Calif.: SAGE Publications, 2003.
MLA引文Singh, Robert. American Government and Politics: A Concise Introduction. SAGE Publications, 2003.
警告：这些引文格式不一定是100％准确.