APA
Cameron S. V., Heckman J. J., . (1998). Life cycle schooling and dynamic selection bias : models and evidence for five cohorts of American males. Cambridge, Mass: National Bureau of Economic Research.
Chicago
Cameron Stephen V, Heckman James J, . 1998. Life cycle schooling and dynamic selection bias : models and evidence for five cohorts of American males. Cambridge, Mass: National Bureau of Economic Research.
Harvard
Cameron S. V., Heckman J. J., . (1998). Life cycle schooling and dynamic selection bias : models and evidence for five cohorts of American males. Cambridge, Mass: National Bureau of Economic Research.
MLA
Cameron Stephen V, Heckman James J, . Life cycle schooling and dynamic selection bias : models and evidence for five cohorts of American males. Cambridge, Mass: National Bureau of Economic Research. 1998.