Warren, G. F. (1911). Elements of agriculture (8th. ed.). Macmillan and Co..
Cita Chicago Style (17a ed.)Warren, G. F. Elements of Agriculture. 8th. ed. London: Macmillan and Co., 1911.
Cita MLA (9a ed.)Warren, G. F. Elements of Agriculture. 8th. ed. Macmillan and Co., 1911.
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