Schonberger, Richard John
Business Publications, 1985
Buku Teks
Schonberger, Richard John
Irwin/McGraw-Hill, 1997
Buku Teks
Schonberger, Richard John
Business Publications , 1981
Buku Teks
Schonberger, Richard John
N.Y. The Free Press, 1986
Buku Teks
Budnick, Frank S.
Richard D. Irwin, 1977
Buku Teks