Kay, Ronald
[Springer, ], 2012
eBooks
Harvard Business School Press, 2004
Buku Teks
Edo Setyadi
2016
UI - Skripsi (Membership)
Elex Media Komputindo, Kelompok Gramedia, 2002
Buku Teks
Lee, Ann
Limkokwing Univerity of Creative Technology, 2008
Buku Referensi