Sakai, Yasuhiro

Risukugaku to wa nani ka

Risukugaku to wa nani ka

2013

Risuku to joho, atarashii keiz

Risuku to joho, atarashii keizaigaku

1991

Kasen to joho no riron

Kasen to joho no riron

1990

Fukakujitsusei no keizaigaku

Fukakujitsusei no keizaigaku

1982