To cite package 'tsfa' in publications use:

Gilbert, Paul D. and Meijer, Erik Time Series Factor Analaysis with an Application to Measuring Money, Research Report 05F10, University of Groningen, SOM Research School.Available from <http://som.eldoc.ub.rug.nl/reports/themeF/2005/05F10/>

Corresponding BibTeX entry:

  @TechReport{,
    author = {Paul D. Gilbert and Erik Meijer},
    year = {2005},
    title = {Time Series Factor Analaysis with an Application to
      Measuring Money},
    number = {05F10},
    institution = {University of Groningen, SOM Research School},
    url = {http://som.eldoc.ub.rug.nl/reports/themeF/2005/05F10/},
  }