Changing agriculture :  an introduction to systems thinking / 
Jim Wilson ; drawings by Jenny Coxon. 
 - 2nd ed. 
 - Kenthurst, [Australia] :   Kangaroo Press,   1992. 
 - 79, [1] p. :   ill. 
<br/><br/>Includes bibliographical references (p. 79-[80]) and index. 
<br/><br/><label>ISBN: </label>0864174896 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agriculture--Mathematical models.<br/>System theory.<br/>System analysis.
<br/><br/><label>Index Terms--Curriculum Objective: </label><br/>BSABE