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