Novi Romauli, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2015
UI - Skripsi (Membership)
Medlik, S
Butterworth-Heinemann, 2000
Buku Teks
Gray, William S.
Menteri Parsenibud, 1999
Buku Teks
edited by martin Nicholas Kunz
teNeues, 2003
Buku Teks
Dittrich, Guy, editor
teNeues, 2006
Buku Referensi