International Institute for Human Resources Development , 1996
Buku Teks
Makiguchi, Tsunesaburo
Caddo Gap Press, , 2002
Buku Teks
edited by Gwen Bell
Hawaii University Press, 1976
Buku Teks
The Dorsey Press, 1973
Buku Teks
Doxiadis, C. A.
Tata McGraw-Hill, 1976
Buku Teks