College Entrance Examination Board. (1931). Examination questions in history (Sixth series, 1926-1930.). Ginn and Co.
Chicago-viite (17. p.)College Entrance Examination Board. Examination Questions in History. Sixth series, 1926-1930. Boston: Ginn and Co, 1931.
MLA-viite (9. p.)College Entrance Examination Board. Examination Questions in History. Sixth series, 1926-1930. Ginn and Co, 1931.
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