APA (7 वां संस्करण) प्रशस्ति पत्र
Walle, A. H. (2001). Qualitative research in intelligence and marketing: The new strategic convergence. Quorum Books.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्र
Walle, Alf H. Qualitative Research in Intelligence and Marketing: The New Strategic Convergence. Westport, Conn.: Quorum Books, 2001.
एमएलए (9वां संस्करण) प्रशस्ति पत्र
Walle, Alf H. Qualitative Research in Intelligence and Marketing: The New Strategic Convergence. Quorum Books, 2001.
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