O.P.E.C [Organization of the petroleum exporting countries]  : Twenty years and beyond 
/ ed. by Ragaei El Mallakh 
. - Boulder  : westview press, c.1982
. - XXIII-270p.  ; 23 cm. 
<br/><br/>Index 
<br/><br/><label>ISBN: </label>0865311633 0709909047 
<br/><br/><label>Source: </label> AMP 770/2661 
<br/><br/><label>Universal Decimal Class. No.: </label>337.91