Iggland, B. (1987). Customer evaluations for industrial product development. Dept. of Management and Economics, Linköping University.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रIggland, Benny. Customer Evaluations for Industrial Product Development. Linköping: Dept. of Management and Economics, Linköping University, 1987.
एमएलए (8वां संस्करण) प्रशस्ति पत्रIggland, Benny. Customer Evaluations for Industrial Product Development. Dept. of Management and Economics, Linköping University, 1987.
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