Hurlimann, Martin
Charles E. Tuttle, 1970
Buku Teks SO
Frederic, Louis
Belknap Press, 2002
Buku Referensi
The Japan Journal Ltd., 2008
Majalah, Jurnal, Buletin
Hisaaki Wake, Keijiro Suga, and Yuki Masami, editors
Lexington Books, 2018
Buku Teks SO
Richardson, Bradley M.
Harper Collins, 1984
Buku Teks SO