Day, R. H., & Singh, I. (1977). Economic development as an adaptive process: The green revolution in the Indian Punjab. Cambridge University Press.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रDay, Richard Hollis, और Inderjit Singh. Economic Development as an Adaptive Process: The Green Revolution in the Indian Punjab. Cambridge: Cambridge University Press, 1977.
एमएलए (9वां संस्करण) प्रशस्ति पत्रDay, Richard Hollis, और Inderjit Singh. Economic Development as an Adaptive Process: The Green Revolution in the Indian Punjab. Cambridge University Press, 1977.
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