//-->
Education, skill, and earnings : further evidence from Ghana
Ackah, Charles, (2014)
The true returns to the choice of occupation and education
Clark, Andrew E., (2021)
Kenya's population growth, education, employment and socio-economic development
Gachuhi, J. M., (1990)
Transportieren, Umschlagen, Lagern
Schönknecht, Rolf, (1986)