4 1 10 BERKE, David Primary Author mixed material 9780470177020 USA Pfeifer 2008 What Efective Managers Really do and How They Do it Sayles, Leonard R. Primary Author mixed material 0717285111 New York McGraw-HillBook 1985 BROADWELL, Martin m. Primary Author mixed material 0471836745 New York John Wiley & Sons Inc. 1986 KOTTLER, Jeffrey A Primary Author mixed material 053401254X Monterey BROOKS COLE PUBLISHING COMPANY 1982