Itoh, Teiji text
Walker Weatherhill, 1968
Buku Referensi
Kiyoyuki, Nishihara
Japan Publications, 1968
Buku Teks SO
Hibi, Sadao
Chronicle Books, 1987
Buku Teks SO
Fujioka, Michio
Kodansha International Ltd, 1995
Buku Teks SO
Engel, Heinrich
Charles E. Tuttle, 1983
Buku Teks SO