Duggar, J. F. (1908). Agriculture for southern schools. The Macmillan Company.
Lua i Stíl Chicago (17ú heag.)Duggar, J. F. Agriculture for Southern Schools. New York: The Macmillan Company, 1908.
Lua MLA (8ú heag.)Duggar, J. F. Agriculture for Southern Schools. The Macmillan Company, 1908.
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