WESTING J H. (1969). PURCHASING MANAGEMENT MATERIALS IN MOTION. JOHN WILEY AND SONS.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रWESTING J H. PURCHASING MANAGEMENT MATERIALS IN MOTION. NEW YORK: JOHN WILEY AND SONS, 1969.
एमएलए (9वां संस्करण) प्रशस्ति पत्रWESTING J H. PURCHASING MANAGEMENT MATERIALS IN MOTION. JOHN WILEY AND SONS, 1969.
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