APA (7 वां संस्करण) प्रशस्ति पत्र
Ostring, P. (2004). Profit-focused supplier management: How to identify risks and recognize opportunities. AMACOM.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Ostring, Pirkko. Profit-focused Supplier Management: How to Identify Risks and Recognize Opportunities. New York: AMACOM, 2004.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Ostring, Pirkko. Profit-focused Supplier Management: How to Identify Risks and Recognize Opportunities. AMACOM, 2004.
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