Gunawardana, A.M.T. Wickramasingh, M.L. Abeyratne, S. <br/><br/>
Farmers' knowledge and perception of improved technology / 
A.M.T.Gunawardana, M.L.Wickramasingh, S.Abeyratne 
 - Colombo  Agrian research and training institute  1980 
 - 83 p. 
 - Research study no.34 .
<br/><br/><label>ISBN: </label>69163 
<br/><br/><label>Dewey Class. No.: </label>631  / SRI