by Roger Blackwell ... [and others]
Cengage Learning Asia, 2006
Buku Teks SO
Schiffman, Leon G.
Prentice-Hall, 1997
Buku Teks
Schiffman, Leon G.
Pearson, 2015
Buku Teks SO
Schiffman, Leon G.
Pearson Education, Inc., 2007
Buku Teks SO
Schiffman, Leon G.
Pearson Education International, 2004
Buku Teks SO