Schwalbe, Kathy, author
Cengage Learning, 2016
Buku Teks
Marchewka, Jack T., author
Wiley, 2003
Buku Teks
Lientz, Bennet P., author
Academic Press , 2000
Buku Teks
James Cadle, Donald Yeates
Financial Times Prentice Hall, 2001
Buku Teks
Earl, Michael J., author
Prentice-Hall, 1989
Buku Teks