Não informado. (1974). Journal of Purchasing and Materials Management. National Association of Purchasing Management.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रNão informado. Journal of Purchasing and Materials Management. Oradell, NJ: National Association of Purchasing Management, 1974.
एमएलए (8वां संस्करण) प्रशस्ति पत्रNão informado. Journal of Purchasing and Materials Management. National Association of Purchasing Management, 1974.
चेतावनी: ये उद्धरण हमेशा 100% सटीक नहीं हो सकते हैं.