Gurūpu wāku
Subtitle: shōdan shidō nyūmon
By: Nagai Saburō cho
Series: YMCA seinen shidō sōsho
Publisher: Nihon Kirisutokyō Seinenkai Dōmei
Published: 1949
Place of publication: Tōkyō
Language: jpn
Number of pages: 122
Subjects: Social group work