Shimizu, Ryuei, author
Keio Tsushin, 1978
Buku Teks
Tokyo, Kasumigasaki Chiyoda-ku J.N.T.O, 1993.,
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Syuhada Marwan, author
2019
UI - Tesis (Membership)
Agus Sardjono, author
Faculty of Law University of Indonesia, 2016
Artikel Jurnal
Travel Bureau, 1975
Buku Referensi