@techreport{NBERw14065,
 title = "The Persistence of Teacher-Induced Learning Gains",
 author = "Brian A. Jacob and Lars Lefgren and David Sims",
 institution = "National Bureau of Economic Research",
 type = "Working Paper",
 series = "Working Paper Series",
 number = "14065",
 year = "2008",
 month = "June",
 URL = "http://www.nber.org/papers/w14065",
}