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Author

Yukio Okada

4 books found

Cover of Nihon no iryō o kirihiraku ijihō

Nihon no iryō o kirihiraku ijihō

Hirofumi Uchida, Yukio Okada, Mayumi Uchiyama · First published 2022

Cover of Shōnen shihō ni okeru kagaku shugi

Shōnen shihō ni okeru kagaku shugi

Yukio Okada · First published 2012

Cover of Ningen kaifuku no keiji hōgaku

Ningen kaifuku no keiji hōgaku

Akira Morio, Yasutaka Morikawa, Yukio Okada · First published 2010

Cover of Seisaku hōmu to jichitai

Seisaku hōmu to jichitai

Yukio Okada · First published 1989