Jeong Ji Seong
Jeong Ji Seong, 2008
Buku Teks
Novi Romauli
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2015
UI - Skripsi Membership
Medlik, S
Butterworth-Heinemann, 2000
Buku Teks
edited by martin Nicholas Kunz
teNeues, 2003
Buku Teks
Dittrich, Guy, editor
teNeues, 2006
Buku Referensi