A study on the effect of the role of the school principals in delegation of duties on performance of non Academic Staff 
Damayanthi, P.V.A.A. 
 -  2015. 
 - ix,75p.: 
<br/><br/> Amaragunasekara, L. 
<br/><br/><label>Gov. Doc. Class. No.: </label>MPM/T/299