3Laird W Mealier & Gary P . Latham Skills for Management Success: theory, experience and practice , Richard D. Irwin, A Times Mirror Education Group Inc Company, 1996 ,p559.
8Laird W · Mealier & Gary P · Latham Skills for Management Success: theory, experience and practice , Richard D. Irwin, A Times Mirro rEducation Group Inc. Company, 1996 ,p559.