SAYLES, L. R. (1979). Leadership: What effective managers really do...and how they do it. McGraw-Hill.

SAYLES, Leonard R. Leadership: What Effective Managers Really Do...and How They Do It. New York: McGraw-Hill, 1979.

SAYLES, Leonard R. Leadership: What Effective Managers Really Do...and How They Do It. McGraw-Hill, 1979.