by NAGANO, Kazuo, IDA, Fumio, OKUMURA, Hideki
Published in Japan Journal of Educational Technology (20.11.1993)

by 永野, 和男, 飯田, 史男, 奥村, 英樹
Published in 日本教育工学雑誌 (1993)

by Morales, Sofialeticia
Published in The Bilingual review (01.01.1999)

by Gefter, Philip
Published in Chicago tribune (1963) (24.05.2008)

by Gefter, Philip
Published in Pittsburgh post-gazette (Pittsburgh, Pa. 1978) (24.05.2008)

by Gefter, Philip
Published in The New York times (24.05.2008)

Published in Xinhua News Agency - CEIS (27.04.2005)