Dyche`, Jill, author
Addison-Wesley, 2002
Buku Referensi
Adrian Payne, author
Cambridge University Press, 2013
eBooks
Michael Adhikara Budi, author
Fakultas Teknik Universitas Indonesia, 2004
UI - Skripsi (Membership)
Rian Lamani, author
Fakultas Teknik Universitas Indonesia, 2013
UI - Skripsi (Membership)
Harvard Business School Publication, 2001
Buku Teks