Brown, Wilfred
Heinemann, 1971
Buku Teks
Tokyo, Kasumigasaki Chiyoda-ku J.N.T.O, 1993.,
Buku Teks
Syuhada Marwan
2019
UI - Tesis (Membership)
Agus Sardjono
Faculty of Law University of Indonesia, 2016
Artikel Jurnal
Travel Bureau, 1975
Buku Referensi