@techreport{NBERw12063,
 title = "Putting Behavioral Economics to Work: Testing for Gift Exchange in Labor Markets Using Field Experiments",
 author = "Uri Gneezy and John A. List",
 institution = "National Bureau of Economic Research",
 type = "Working Paper",
 series = "Working Paper Series",
 number = "12063",
 year = "2006",
 month = "March",
 URL = "http://www.nber.org/papers/w12063",
}