Mondy, R. Wayne, author
Prentice-Hall, 2010
Buku Teks
Werther, William B., author
McGraw-Hill , 1989
Buku Teks
Crane, Donald P.
Kent publishing company, 1986
Buku Teks
Mondy, R. Wayne, author
Prentice-Hall, 2002
Buku Teks
Werther, William B., author
McGraw-Hill, 1996
Buku Teks