LEIGH DAVID. (1998). ENCYCLOPAEDIA OF PRACTICAL MANAGEMENT TRAINING: GROUPS TRAINING. JAICO PUBLISHING HOUSE.
Lua i Stíl Chicago (17ú heag.)LEIGH DAVID. ENCYCLOPAEDIA OF PRACTICAL MANAGEMENT TRAINING: GROUPS TRAINING. NEW DELHI: JAICO PUBLISHING HOUSE, 1998.
Lua MLA (9ú heag.)LEIGH DAVID. ENCYCLOPAEDIA OF PRACTICAL MANAGEMENT TRAINING: GROUPS TRAINING. JAICO PUBLISHING HOUSE, 1998.
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