(1970). Modern Business: Sales And Sales Management / Elmer G. Leterman. Alexander Hamilton Institute.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रModern Business: Sales And Sales Management / Elmer G. Leterman. Alexander Hamilton Institute, 1970.
एमएलए (8वां संस्करण) प्रशस्ति पत्रModern Business: Sales And Sales Management / Elmer G. Leterman. Alexander Hamilton Institute, 1970.
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