@techreport{NBERr0007,
 title = "Substitution and Division of Labour",
 author = "Sherwin Rosen",
 institution = "National Bureau of Economic Research",
 type = "Working Paper",
 series = "Reprint Series",
 number = "7",
 year = "1979",
 month = "April",
 URL = "http://www.nber.org/papers/r0007",
 abstract = {},
}