Schonberger, Richard John
Business Publications, 1985
Buku Teks
Schonberger, Richard John
Business Publications , 1981
Buku Teks
Schonberger, Richard John
Chicago Irwin 1997,
Buku Teks
Schonberger, Richard John
N.Y. The Free Press, 1986
Buku Teks
Schonberger, Richard John
The Free Press , 1982
Buku Teks