@techreport{NBERw14021,
 title = "The Narrowing Gap in New York City Teacher Qualifications and its Implications for Student Achievement in High-Poverty Schools",
 author = "Donald Boyd and Hamilton Lankford and Susanna Loeb and Jonah Rockoff and James Wyckoff",
 institution = "National Bureau of Economic Research",
 type = "Working Paper",
 series = "Working Paper Series",
 number = "14021",
 year = "2008",
 month = "June",
 URL = "http://www.nber.org/papers/w14021",
}