Cain, Brian, author
Glorier International, 1999
Buku Referensi
Amos, Julie-Ann, author
Glorier International, 2001
Buku Referensi
Claxton, john, author
Glorier International, 1999
Buku Referensi
Mendelson, Martin, author
Pustaka Binawan Pressindo, 1997
Buku Referensi
Renata Parsaulian, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2020
UI - Tesis (Membership)