@inbook{NBERc12609,
 Crossref = "NBERenge11-1",
 title = "Inequality and the Evolution of Taxation",
 author = "Kenneth L. Sokoloff and Eric M. Zolt",
 BookTitle = "Economic Development in the Americas since 1500: Endowments and Institutions",
 Publisher = "Cambridge University Press",
 year = "2011",
 month = "November",
 URL = "http://www.nber.org/chapters/c12609",
}
@book{NBERenge11-1,
 title = "Economic Development in the Americas since 1500: Endowments and Institutions",
 author = "Stanley L. Engerman and Kenneth L. Sokoloff",
 institution = "National Bureau of Economic Research",
 type = "Book",
 publisher = "Cambridge University Press",
 year = "2012",
 URL = "http://www.nber.org/books/enge11-1",
}