A study on the impact of the performance appraisal system of Udarata Development Authority of Sri Lanka 
Rathnayaka, R.M/L.W.L. 
 -  2015. 
 - xvi,82p.: 
<br/><br/> Sudasinghe, S.R.S.N. 
<br/><br/><label>Gov. Doc. Class. No.: </label>MPM/T/384