Research in human capital and development :  a research annual / 
 A research manual 
editor : Ismail Sirageldin 
 - Greenwich, Connecticut :  Jai Press,  1979- 
 - 3v. :  ill. /  24 cm. 
<br/><br/><label>ISBN: </label>0892320192 (volume 1) 0892320982 (volume 2) 0892321296 (supplement 1) 0892321660 (volume 3)