Mahmud Bangkaru
Regional Office Department of Tourpostel, 1996
Buku Referensi
Duncan, Scott F.M., editor
Springer, 2012
eBooks
Ika Yulistyawati, author
Fakultas Ekonomi dan Bisnis Universitas Indonesia, 2010
UI - Tesis (Open)
Epson Ray Kinko, author
Fakultas Teknik Universitas Indonesia, 2016
UI - Skripsi (Membership)
Wingate, Isabel B. (Isabel Barnum), author
Englewood Cliffs, NJ: Prentice-Hall, 1955
Buku Teks