Werther, William B., author
McGraw-Hill , 1989
Buku Teks
Crane, Donald P.
Kent publishing company, 1986
Buku Teks
Werther, William B., author
McGraw-Hill, 1986
Buku Teks
Carrell, Michael R., author
Irwin, 1984
Buku Teks
Werther, William B., author
McGraw-Hill, 1996
Buku Teks