Marzuki Usman, author
HL, 1999
Buku Teks
Azmi Ab Rahman, author
Mind Educate Resources, 2010
Buku Referensi
Malaysia. Kuala Lumpur Tourism Association
Kuala Lumpur Tourism Association, 2010
Buku Referensi
Universitas Indonesia, 2014
UI - Skripsi (Membership)
APA Publications , 2007
Buku Referensi