TY  - JOUR
AU  - Isfahani, Karam
AU  - Soleimani, Nader
AU  - toorani, heidar
AU  - Sabahi, Parviz
TI  - Design and validate a model for the professional development of school principals in a mixed manner
JO  - Journal of New Approaches in Educational Administration
VL  - 11
IS  - 45
SP  - 103
EP  - 132
PY  - 2020
DO  - 
ER  -