Schultz, Theodore W.
Agriculture in an ucstable economy / Theodore W. Schultz
McGraw-Hill, 1945
 Buku Teks SO
Briggs, David J.
Agriculture and environment: the physical geography of temperature agriculture systems
Longman Scientific & Technical, 1994
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Jaleel Ahmad
The Expert and the administrator
University of Pittsburgh, 1959
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Hokanson, Clifford M.
Applied problems in mathematics for agriculture
Interstate Printers, 1984
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Hospital administrator
National Learning Corporation, 1991
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