Beard, C. A., & Beard, M. R. B. (1960). Beard's New basic History of the United States (2nd ed.). Double day.
Styl ChicagoBeard, Charles A., a Mary R Beard Beard. Beard's New Basic History of the United States. 2nd ed. New York: Double day, 1960.
Citace podle MLABeard, Charles A., a Mary R Beard Beard. Beard's New Basic History of the United States. 2nd ed. Double day, 1960.
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