TY  - BOOK
AU  - Covey,Stephen R.
TI  - Principle-centered leadership
SN  - 9780671749101
PY  - 1991///
CY  - New-York
PB  - Summit Books
KW  - BI-BuBU
KW  - Psychologie du développement
KW  - Book
N1  - Index
ER  -