Apartheid and social research / 
Edited and introduced by John Rex. 
 - Paris :  UNESCO,  1981. 
 - 199 p. 
<br/><br/><label>ISBN: </label>9231018981 
<br/><br/><label>No. de Clasificación Universal Decimal: </label>323.1 (680)=20 "1981" APA.