@article{Green2003,
author = {Green, D. and Riddell, W.C.},
title= {Literacy and earnings: An investigation of the interaction of cognitive and unobserved skills in earnings generation},
year = {2003},
doi = {10.1016/S0927-5371(03)00008-3},
volume = {10},
number = {2},
pages = {165--184},
}