Velasquez, Manuel G., author
Pearson, 2006
Buku Teks
Velasquez, Manuel G., author
Pearson, 2014
Buku Teks
Velasquez, Manuel G
Prentice-Hall, 2002
Buku Teks
Velasquez, Manuel G., author
Pearson , 1998
Buku Teks
Hoffman, W. Michael, author
McGraw-Hill, 1995
Buku Teks