Artikel Jurnal
Stanford University Press, 1988
Buku Teks
Okita, Saburo
Japan Foundation, 1975
Buku Teks SO
Bisson, T.A.
Institute of Pasific Ralations, 1945
Buku Teks SO
by Yutaka Tazawa ... [and others]
Ministry of Foreign Affairs, 1973
Buku Teks SO