Natsubara, Shinichi, Ikuko Tokida and Hajime Hirai, et al.: "TV kaigi system wo riyousita jugyou no sikenteki jishi to digital contents seisaku ni kansuru kenkyu(Japanese)"Nihon Sangyou Gijutu Kyouiku Gakkai, 43 kai Zenkoku Taikai Kouen Youshi Shu. 13 (20

Natsubara、Shinichi、Ikuko Tokida 和 Hajime Hirai 等人：“TV kaigi system wo riyousita jugyou no sikenteki jishi to digital content seisaku ni kansuru kenkyu（日语）”Nihon Sangyou Gijutu Kyouiku Gakkai，43 kai Zenkoku Taikai Kouen Youshi Shu。