Greenhalgh, C. (1990). Innovation and Trade Performance in the United Kingdom.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रGreenhalgh, C. Innovation and Trade Performance in the United Kingdom. 1990.
एमएलए (9वां संस्करण) प्रशस्ति पत्रGreenhalgh, C. Innovation and Trade Performance in the United Kingdom. 1990.
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