Wilson, G., & Ryland, G. (1949). Social group work practice: The creative use of the social process. Houghton.
Lua i Stíl Chicago (17ú heag.)Wilson, Gertrude, agus Gladys Ryland. Social Group Work Practice: The Creative Use of the Social Process. Boston: Houghton, 1949.
Lua MLA (9ú heag.)Wilson, Gertrude, agus Gladys Ryland. Social Group Work Practice: The Creative Use of the Social Process. Houghton, 1949.
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