Balinski, Michel L. and Young, H. Peyton, Fair Representation: Meeting the Ideal of One Man, One Vote, 2nd edition, Brookings Institution Press, Washington, D.C., 2001.
Ernst, Lawrence R., Apportionment Methods for the House of Representatives and the Court Challenges, Management Science, Vol. 40, Issue 10 (1994), p. 1207-1227. Available at http://www.amstat.org/sections/SRMS/proceedings/papers/1992_118.pdf
Huntington, Edward V., The Mathematical Theory of the Apportionment of Representatives, Proceedings of the National Academy of Sciences, 1921 7:123-127. Available at PNAS: http://www.pnas.org/content/7/4/123.full.pdf+html
Neubauer, Michael G., and Zeitlin, Joel, Apportionment and the 2000 Election, The College Mathematics Journal, Vol. 34, No. 1, (2003), p. 2-10.
Toplak, Jurij, Equal Voting Weight of All: Finally 'One Person, One Vote' from Hawaii to Maine?, Social Science Research Network. Available at SSRN: http://ssrn.com/abstract=1001219