Potter, D. (1970). Discussion: A guide to effective... (2nd.ed.). Wadsworth.
Chicago-čujuhus (17. p.)Potter, David. Discussion: A Guide to Effective... 2nd.ed. California: Wadsworth, 1970.
MLA-čujuhus (9. p.)Potter, David. Discussion: A Guide to Effective... 2nd.ed. Wadsworth, 1970.
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