Schultz, Theodore W.
The Minchigan of Univ. Press, 1966
Buku Teks
edited by Clifton R. Wharton
Aldine Publishig, 1969
Buku Teks
edited by Carl Eicher and Lawrence Witt
McGraw-Hill , 1964
Buku Teks SO
edited by Kazushi Ohkawa, Bruce F. Johnston and Hiromitsu Kaneda
University of Tokyo Press, 1969
Buku Teks
Food and Agriculture Organization of the United Nations , 1985
Buku Teks SO