Artikel Jurnal
Gutbrod, Roger, author
[Springer, Springer], 2012
eBooks
Epstein, Robert, author
McGraw-Hill, 2000
Buku Teks
Kleon, Austin, author
Mizan Publika, 2015
Buku Teks
Brynteson, Richard, author
[American Management Association;;, ], 2013
eBooks