McEnally, Martha, author
Pearson Education, 2002
Buku Teks
Engel, James F., author
Chicago Dryden Press, 1990
Buku Teks
Mowen, John C., author
Macmillan, 1987
Buku Teks
Schiffman, Leon G., author
Prentice-Hall, 1997
Buku Teks
Peter, J. Paul, author
Erlangga, 1999
Buku Teks