A study on the effectiveness of Science magazine distributed by National Science foundation for popularization of science among the school children special reference to Colombo district 
Sapumohotti, S.N.P.K. 
 -  2016. 
 - ix,70p.: 
<br/><br/> Sudasinghe, S.R.S.N., & Wattewidanage, J. 
<br/><br/><label>Gov. Doc. Class. No.: </label>MPM/T/392