Wilson, Jim. <br/><br/>
Changing agriculture :  an introduction to systems thinking / drawings by Jenny Coxon. 
Jim Wilson ; 
 - 2nd ed. 
 - Kenthurst, NSW :  Kangaroo Press,  1992. 
 - 80 p. :  ill. 
<br/><br/> 1995 reprint. 
<br/><br/><label>ISBN: </label>0864174896 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agriculture--Philosophy.<br/>Agricultural systems.<br/>System analysis.