Cascio, E. U. (2009). Maternal Labor Supply and the Introduction of Kindergartens into American Public Schools. The Journal of human resources, 44(1), pp. 140-170. doi:10.3368/jhr.44.1.140

Cascio, Elizabeth U. "Maternal Labor Supply and the Introduction of Kindergartens Into American Public Schools." The Journal of Human Resources 44, no. 1 (2009): 140-170.

Cascio, Elizabeth U. "Maternal Labor Supply and the Introduction of Kindergartens Into American Public Schools." The Journal of Human Resources 44.1 (2009): 140-170.