Jewkes, J. (1960). The sources of invention. New York: St. Martin's Press.
Trích dẫn kiểu ChicagoJewkes, John. The Sources of Invention. New York: St. Martin's Press, 1960.
Deismireacht MLAJewkes, John. The Sources of Invention. New York: St. Martin's Press, 1960.
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