Schlippe, Pierre De. <br/><br/>
Shifting cultivation in Africa :  the Zande system of agriculture / 
Pierre De Schlippe. 
 - London :  Routledge,  c1956. 
 - xxxi, various pagings. : 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Shifting cultivations--West Africa.