Velasquez, Manuel G., author
Pearson , 1998
Buku Teks
Velasquez, Manuel G
Prentice-Hall, 2002
Buku Teks
Henn, Stephen K., author
Wiley, 2009
Buku Teks
Ferrell, O.C., author
Cengage Learning, 2015
Buku Teks
Hoffman, W. Michael, author
McGraw-Hill, 1995
Buku Teks