Bradfield, D. J. <br/><br/>
Guide to extension training / 
by D. J. Bradfield 
 - Rome :  Food and Agriculture Organization of the United Nations,  1966 
 - 169 p. :  ill. ;  23 cm. 
<br/><br/>p. 158-161 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Agricultural extension work--Study and teaching