Yōko Yumoto

Goi imiron no arata na kanōsei

Goi imiron no arata na kanōsei o sagutte

2015

Fukuzatsu jutsugo kenkyū no ge

Fukuzatsu jutsugo kenkyū no genzai

2014

Goi no imi to bunpō

Goi no imi to bunpō

2009

Fukugō dōshi, hasei dōshi no i

Fukugō dōshi, hasei dōshi no imi to tōgo

2005