TY  - BOOK
AU  - ROBERTO Michael A.
TI  - Know what you don't know: how great leaders prevent problems before they happen 
SN  - 9780131568150 (hbk) :
PY  - 2009///
CY  - United States Of America
PB  - Wharton School Publishing, 
N1  - xxii, 202 p
ER  -