Wageningen: Afdeling Agrarische Geschiedenis Landbouwuniversiteit
Majalah, Jurnal, Buletin
Rangaswami, G.
Prentice Hall of India, 1987
Buku Teks
Development Assistance, [date of publication not identified]
Buku Teks
Murray, William G.
The Iowa State University, 1963
Buku Teks
Bangkit Media Tani, 2009
Majalah, Jurnal, Buletin