Research Institute of Agricultural Economics & Popp, J. (2008). Studies in agricultural economics: No. 108.
शिकागो शैली (17वां संस्करण) प्रशस्ति पत्रResearch Institute of Agricultural Economics और Jozsef Popp. Studies in Agricultural Economics: No. 108. 2008.
एमएलए (9वां संस्करण) प्रशस्ति पत्रResearch Institute of Agricultural Economics और Jozsef Popp. Studies in Agricultural Economics: No. 108. 2008.
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