It looks like the optional books are not all listed on the UT bookstore website, so just in case here is a list. Again, these are not required, but they may be useful to you in your research careers.
Anderson, T. & Kanuka, H. (2003). E-Research: Methods, strategies and issues. Boston, MA: Allyn & Bacon.
Di Gregorio, S. & Davidson, J. (2008). Qualitative research design for software users. New York, NY: McGraw Hill.
Fielding, N., Lee, R.M. & Blank, G. (2008). The SAGE handbook of online research methods. London: Sage Publications.
Gibbs, G. (2008). Analysing qualitative data. The Sage Qualitative Research Kit, Edited by U. Flick. London, Sage Publications.
Hart, C. (1999). Doing a literature review: Releasing the social science research imagination. London: Sage Publications.
Howell Major, C. & Savin-Baden, M. (2010). An introduction to qualitative research synthesis: Managing the information explosion in social science research. New York: Routledge.
Kozinets, R.V. (2009). Netnography: Doing ethnographic research online. London: Sage Publications.
Lewins, A. & Silver, C. (2007). Using software in qualitative research: a step by step guide. London: Sage Publications.
Maxwell, J.A. (2005). Qualitative research design: An interactive approach. London: Sage Publications.
Saldaña, J. (2009). The coding manual for qualitative researchers. London: Sage Publications.
Wolcott, H. (2009). Writing up qualitative research, 3rd edition. London: Sage Publications.