Lele, Uma J. <br/><br/>
Population pressure, the environment, and agricultural intensification :  variations on the Boserup hypothesis / 
Uma Lele, Steven W. Stone. 
 - Washington, D.C. :  World Bank,  c1989. 
 - 79 p. :  ill. ;  28 cm. 
 - MADIA discussion paper ;  4 .