Eri Banno, Yoko Ikeda, Yutaka Ohno, Chikako Shinagawa, Kyoko Tokashiki : GENKI: An Integrated Course in Elementary Japanese I [Second Edition] , 2011. ISBN: 978-4-7890-1443-4.
Eri Banno, Yoko Ikeda, Yutaka Ohno, Chikako Shinagawa, Kyoko Tokashiki : GENKI: An Integrated Course in Elementary Japanese II [Second Edition] , 2011. ISBN: 978-4-7890-1444-1.