APA
Hughes L. Richard, Ginnett C. Robert and Curphy J. Gorden, . (1999). LEADERSHIP. Boston: McGraw-Hill.
Chicago
Hughes L. Richard, Ginnett C. Robert and Curphy J. Gorden, . 1999. LEADERSHIP. Boston: McGraw-Hill.
Harvard
Hughes L. Richard, Ginnett C. Robert and Curphy J. Gorden, . (1999). LEADERSHIP. Boston: McGraw-Hill.
MLA
Hughes L. Richard, Ginnett C. Robert and Curphy J. Gorden, . LEADERSHIP. Boston: McGraw-Hill. 1999.