Blanchard, Kenneth H., author
Fontana , 1983
Buku Teks
Blanchard, Kenneth H., author
Fontana/Collins , 1987
Buku Teks
Blanchard, Kenneth H., author
Fontana/Collins, 1989
Buku Teks
Blanchard, Kenneth H., author
Elex Media Komputindo, 2001; 1995
Buku Teks
Webber, Ross A., author
Richard D. Irwin, 1981
Buku Teks