Farm and village production systems in the semi-arid tropics of west-Africa  : an interpretative review of research 
/ David W.Norman,..., Mark D.Newman,.. ismael Ouedraogo,.. 
. - Andhra Pradesh  : International crops research institute for Semi-Arid Tropics, 1981
. - VI-94 p.  ; 28 cm. 
 - Research bulletin  vol.1  4 .
<br/><br/><label>Source: </label> Achat 
<br/><br/><label>Universal Decimal Class. No.: </label>338.922.