New York : Vintage Book, 1969
Buku Teks
Tokyo, Kasumigasaki Chiyoda-ku J.N.T.O, 1993.,
Buku Teks
Rizky Aulia Pangestika, author
Fakultas Ilmu Pengetahuan dan Budaya Universitas Indonesia, 2019
UI - Skripsi Membership
Korea Tourism Organization, [date of publication not identified]
Buku Teks
Travel Bureau, 1975
Buku Referensi