Study on waste management system in the printing industry of Colombo district 
Jayavilal, L.B.C. 
 -  2007. 
 - vii,56p.: 
<br/><br/> Jayasundara, N.J., & Amaragunasekara, S.D.L. 
<br/><br/><label>Gov. Doc. Class. No.: </label>MPM/T/79