To cite package distrTeach in publications use:

Ruckdeschel, P., Kohl, M., Stabla, T., & Camphausen, F. (2006): S4 Classes for Distributions---a manual for packages distr, distrSim, distrTEst, distrEx, distrMod, and distrTeach

Corresponding BibTeX entry:

  @TechReport{,
    author = {P. Ruckdeschel and M. Kohl and T. Stabla and F.
      Camphausen},
    title = {{S4 Classes for Distributions---a manual for packages
      distr, distrSim, distrTEst, distrEx, distrMod, and distrTeach}},
    language = {English},
    institution = {{Fraunhofer ITWM}},
    month = {July},
    year = {2008},
    address = {{Kaiserslautern, Germany}},
    url =
      {http://cran.r-project.org/web/packages/distrDoc/vignettes/distr.pdf},
  }