Schiffman, Leon G., author
Prentice-Hall, 1997
Buku Teks
Schiffman, Leon G., author
Pearson, 2015
Buku Teks
Schiffman, Leon G., author
Pearson Education International, 2004
Buku Teks
Schiffman, Leon G., author
Pearson Education, Inc., 2007
Buku Teks
Peter, J. Paul, author
Mc Graw-Hill, 2001
Buku Teks