Horton,  D. <br/><br/>
Monitoring and evaluating agricultural research 
D. Horton, P. Ballantyne, W. Peterson, B. Uribe, D. Gapasin and K.  Sheridan 
 - Wallingford  C.A.B. International  1993 
 - xvi, 219p.: ills., tablee 
<br/><br/><label>ISBN: </label>851988601