O`Leary, Elizabeth, author
Andi, 2002
Buku Teks
Furtwengler, Dale, author
Andi, 2003
Buku Teks
Stevenson, Nancy, author
Andi, 2002
Buku Teks
Davidson, Jeff, author
Andi , 2002
Buku Teks
Blanchard, Kenneth H., author
Elex Media Komputindo, 2001; 1995
Buku Teks