Schroeder, R. C. (1999). An outline of American Government. USA: United states Information agency.
Trích dẫn kiểu ChicagoSchroeder, Richard C. An Outline of American Government. USA: United states Information agency, 1999.
MLA citiranjeSchroeder, Richard C. An Outline of American Government. USA: United states Information agency, 1999.
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