Robinson, Marguerite S., author
Oxford University Press, 1988
Buku Teks
Neale, Walter C., author
Yale University Press, 1962
Buku Teks
Hara Tamiki, author
Nakanishi Printing Company, 2019
Artikel Jurnal
Hara Tamiki, author
Nakanishi Printing Company;Nakanishi Printing Company, 2019
Artikel Jurnal
Andrain, Charles F., author
Macmillan, 1995
Buku Teks