Cooper, M. M., & Morris, D. W. (1973). Grass farming (3rd edition.). Farming Press.
Cita Chicago Style (17a ed.)Cooper, M. Mcg, y David W. Morris. Grass Farming. 3rd edition. Ipswich: Farming Press, 1973.
Cita MLA (8a ed.)Cooper, M. Mcg, y David W. Morris. Grass Farming. 3rd edition. Farming Press, 1973.
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