Potter, D. (1976). Discussion in small groups: A guide to effective practice (3rd ed.). Wadsworth.
Lua i Stíl Chicago (17ú heag.)Potter, David. Discussion in Small Groups: A Guide to Effective Practice. 3rd ed. California: Wadsworth, 1976.
Lua MLA (9ú heag.)Potter, David. Discussion in Small Groups: A Guide to Effective Practice. 3rd ed. Wadsworth, 1976.
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