Kosaka, Masataka
Kodansha International , 1972
Buku Teks
Joji Watanuki
University of Tokyo Press, 1977
Buku Teks
Krauss, Ellis S.
University of California Press, 1974
Buku Teks
Artikel Jurnal
National Research Institute of Agricultural Economic, Ministry of Agriculture, Forestry and Fisheries , 2000
Buku Teks