Cramer, G. L., .Cramer, G. L., & .Heid, W. G. (1983). Grain marketing economics. John Wiley & Sons.
Lua i Stíl Chicago (17ú heag.)Cramer, Gail L., Gail L. .Cramer, agus Walter G. .Heid. Grain Marketing Economics. New York: John Wiley & Sons, 1983.
Lua MLA (9ú heag.)Cramer, Gail L., et al. Grain Marketing Economics. John Wiley & Sons, 1983.
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