Martin, David, author
Rigby, 1981
Buku Teks
Takahashi, M., author
Taiseido Shobo, [date of publication not identified]
Buku Referensi
Takahashi, Mario, author
Taiseido Shobo, 1975
Buku Referensi
Hisamatsu, Senichi, author
Kodansha International, 1978
Buku Referensi
Hisamatsu, Senichi, author
Kodansha International, 1976
Buku Referensi