Grennes, T., Johnson, P. R., & Thursby, M. (1978). The economics of world grain trade. Praeger.
Lua i Stíl Chicago (17ú heag.)Grennes, Thomas, Paul R. Johnson, agus Marie Thursby. The Economics of World Grain Trade. New York: Praeger, 1978.
Lua MLA (8ú heag.)Grennes, Thomas, et al. The Economics of World Grain Trade. Praeger, 1978.
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