Theobald, R. (1961). The challenge of abundance. New York: C. N. Potter.
Trích dẫn kiểu ChicagoTheobald, Robert. The Challenge of Abundance. New York: C. N. Potter, 1961.
Deismireacht MLATheobald, Robert. The Challenge of Abundance. New York: C. N. Potter, 1961.
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