Tadahiro Hata Naoki Ushijima Hiroyuki Hiraga Kenzi Watanabe Development and Experiment of a Game Based Learning Program for e-Money Literacy Education. 173-175 2007 conf/digitel/2007 DIGITEL http://doi.ieeecomputersociety.org/10.1109/DIGITEL.2007.16 db/conf/digitel/digitel2007.html#HataUHW07