Dostupnost

Carter, Susan B., ed. et al. Historical statistics of the United States: earliest times to the present. Volume two, Part B, Work and welfare. First published. Cambridge: Cambridge University Press, 2006. xiv, 934, 30 stran. ISBN 0-521-81791-9.

Carter, S. B., Gartner, S. S., Haines, M. R., Olmstead, A. L., Sutch, R., & Wright, G. (2006). Historical statistics of the United States: Earliest times to the present (Millennial edition.). Cambridge ; New York: Cambridge University Press.

Carter, Susan B., Scott Sigmund Gartner, Michael R. Haines, Alan L. Olmstead, Richard Sutch, and Gavin Wright. Historical Statistics of the United States: Earliest Times to the Present. Millennial edition. Cambridge ; New York: Cambridge University Press, 2006.

Carter, Susan B., et al. Historical Statistics of the United States: Earliest Times to the Present. Millennial edition. Cambridge ; New York: Cambridge University Press, 2006.