Rōdōhō no sōtenKunishige Sumida, Katsutoshi Kezuka, Mutsuko Asakura · First published 2004Open the Tome
Kobetsu rōdō funsō shori shisutemu no kokusai hikakuKatsutoshi Kezuka, Kōji Yamashita · First published 2002Open the Tome
