APA
Doyle O. e. a., National Bureau of Economic Research, . (2013). Measuring investment in human capital formation. Cambridge: NBER.
Chicago
Doyle Orla et al, National Bureau of Economic Research, . 2013. Measuring investment in human capital formation. Cambridge: NBER.
Harvard
Doyle O. e. a., National Bureau of Economic Research, . (2013). Measuring investment in human capital formation. Cambridge: NBER.
MLA
Doyle Orla et al, National Bureau of Economic Research, . Measuring investment in human capital formation. Cambridge: NBER. 2013.