Zelko, H. P. (1957). Succesful conference and discussion techniques. Mc Graw- Hill Book Company Inc.
Chicago Edition CitationZelko, Harold P. Succesful Conference and Discussion Techniques. U S A: Mc Graw- Hill Book Company Inc, 1957.
MLA Edition CitationZelko, Harold P. Succesful Conference and Discussion Techniques. Mc Graw- Hill Book Company Inc, 1957.
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