Beets, W. C. (1982). Multiple cropping and tropical farming systems. Gower Pub.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रBeets, Willem C. Multiple Cropping and Tropical Farming Systems. England: Gower Pub, 1982.
एमएलए (9वां संस्करण) प्रशस्ति पत्रBeets, Willem C. Multiple Cropping and Tropical Farming Systems. Gower Pub, 1982.
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