APA
Humphries J. E. e. a., National Bureau of Economic Research, . (2024). Parents earnings and the returns to universal pre-kindergarten. Cambridge: NBER.
Chicago
Humphries John Eric et al, National Bureau of Economic Research, . 2024. Parents earnings and the returns to universal pre-kindergarten. Cambridge: NBER.
Harvard
Humphries J. E. e. a., National Bureau of Economic Research, . (2024). Parents earnings and the returns to universal pre-kindergarten. Cambridge: NBER.
MLA
Humphries John Eric et al, National Bureau of Economic Research, . Parents earnings and the returns to universal pre-kindergarten. Cambridge: NBER. 2024.