1. American Institute of Physics. Scitation. http://scitation.aip.or .
2. American Mathematical Society. (2009). Annual Survey of the Mathematical Sciences. American Mathematical Society, Providence. http://www.ams.org/employment/surveyreports.htm .
3. American Mathematical Society. (2010). 2010 Mathematics Subject Classification. http://www.ams.org/msc .
4. Auburn University. (2010). Student credit hours and weighted credit hours fall 2008. Auburn: Office of Institutional Research and Assessment. https://oira.auburn.edu/factbook/acadinfo/credithrs/credithrsfall2008.aspx .
5. Bates, M. J. (1999). The invisible substrate of information science. Journal of the American Society for Information Science, 50(1), 1043–1050.