Shepherd, Geoffrey S., author
Iowa State University Press, 1968
Buku Teks
Cleaver, Kevin M.
The World Bank , 1980
Buku Teks
Roumasset, James, author
National University Press, c1981
Buku Teks
Horwitz, William, editor
Association of Official Agricultural Chemists, 1955
Buku Referensi
Pusat Analisis Sosial Ekonomi dan Kebijakan Pertanian BPPP-Deptan, [, 2008]
Majalah, Jurnal, Buletin