Japan. Sōrifu. Tōkeikyoku. (1950). Rōdōryoku chōsa: Shinsuikei ni yoru sangyō oyobi shūgyōjō no chiibetsu shūgyōshasū : Shōwa 22-nen 10-gatsu-Shōwa 26-nen 6-gatsu. Sōrifu Tōkeikyoku.
Dyfyniad Arddull ChicagoJapan. Sōrifu. Tōkeikyoku. Rōdōryoku Chōsa: Shinsuikei Ni Yoru Sangyō Oyobi Shūgyōjō No Chiibetsu Shūgyōshasū : Shōwa 22-nen 10-gatsu-Shōwa 26-nen 6-gatsu. [Tokyo]: Sōrifu Tōkeikyoku, 1950.
Dyfyniad MLAJapan. Sōrifu. Tōkeikyoku. Rōdōryoku Chōsa: Shinsuikei Ni Yoru Sangyō Oyobi Shūgyōjō No Chiibetsu Shūgyōshasū : Shōwa 22-nen 10-gatsu-Shōwa 26-nen 6-gatsu. Sōrifu Tōkeikyoku, 1950.
Rhybudd: Mae'n bosib nad yw'r dyfyniadau hyn bob amser yn 100% cywir.