Briggs, David J.
Agriculture and environment: the physical geography of temperature agriculture systems
Longman Scientific & Technical, 1994
 Buku Teks
Mosher, Arthur T.
Serving agriculture as an administrator
Agricultural Development Council, 1975
 Buku Teks
Schultz, Theodore W.
Transforming traditional agriculture / Theodore W. Schultz
Yale University Press , 1964
 Buku Teks
Schultz, Theodore W.
Economic crises in world agriculture/Theodore W. Schultz
The Minchigan of Univ. Press, 1966
 Buku Teks
Wardlaw, C.W.
Cellular diferentiation in plants and other essays / C W Wardlaw
Manchester University Press , 1970
 Buku Teks