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First Author:
 
Sayef Bakari
LIEI, University of Tunis El Manar, Tunisia.
bakari.sayef@yahoo.fr
 
école primaire cité des jeunes 1 Gafsa 2100
GAFSA, 2100, Tunisie
 
+21640479907(Phone)
+21640479907(Fax)

Second Author:

Mohamed Mabrouki
Higher Institute of Companies Administration University of Gafsa, Tunisia.
mabroukimed@gmail.com
 
Gafsa, 2100, Tunisia
 
 
 

Third Author:

Asma Elmakki
Higher Institute of Companies Administration University of Gafsa, Tunisia.
asmaelmakki@yahoo.com
 
Sned, 2100, Tunisia