Research Institute of Agricultural Economics & Popp, J. (2008). Studies in agricultural economics: No. 108.
Tohutoru Kātū Chicago (17th ed.)Research Institute of Agricultural Economics me Jozsef Popp. Studies in Agricultural Economics: No. 108. 2008.
Tohutoro MLA (9th ed.)Research Institute of Agricultural Economics me Jozsef Popp. Studies in Agricultural Economics: No. 108. 2008.
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