@techreport{NBERw13127,
 title = "The Time and Timing Costs of Market Work",
 author = "Daniel S. Hamermesh and Stephen Donald",
 institution = "National Bureau of Economic Research",
 type = "Working Paper",
 series = "Working Paper Series",
 number = "13127",
 year = "2007",
 month = "May",
 URL = "http://www.nber.org/papers/w13127",
}