APA
Hoxby C. M., . (1998). The effects of class size and composition on student achievement : new evidence from natural population variation. Cambridge, Mass: National Bureau of Economic Research.
Chicago
Hoxby Caroline M, . 1998. The effects of class size and composition on student achievement : new evidence from natural population variation. Cambridge, Mass: National Bureau of Economic Research.
Harvard
Hoxby C. M., . (1998). The effects of class size and composition on student achievement : new evidence from natural population variation. Cambridge, Mass: National Bureau of Economic Research.
MLA
Hoxby Caroline M, . The effects of class size and composition on student achievement : new evidence from natural population variation. Cambridge, Mass: National Bureau of Economic Research. 1998.