Ducat, C. R. (1970). The government of the United States: Students workbook and readings. Charles Scribner's Sons.
Chicago-viite (17. p.)Ducat, Craig R. The Government of the United States: Students Workbook and Readings. New York: Charles Scribner's Sons, 1970.
MLA-viite (9. p.)Ducat, Craig R. The Government of the United States: Students Workbook and Readings. Charles Scribner's Sons, 1970.
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