To cite package distr in publications use:

Peter Ruckdeschel, Matthias Kohl, Thomas Stabla, Florian Camphausen (2006). S4 Classes for Distributions. R News, 6(2), 2-6. URL http://CRAN.R-project.org/doc/Rnews/

If you employ convolution, please also cite:

Peter Ruckdeschel, Matthias Kohl (2014). General Purpose Convolution Algorithm in S4 Classes by Means of FFT. Journal of Statistical Software, 59(4), 1-25. URL http://www.jstatsoft.org/v59/i04/.

Corresponding BibTeX entries:

  @Article{,
    title = {S4 Classes for Distributions},
    author = {P. Ruckdeschel and M. Kohl and T. Stabla and F.
      Camphausen},
    language = {English},
    year = {2006},
    journal = {R News},
    year = {2006},
    volume = {6},
    number = {2},
    pages = {2--6},
    month = {May},
    url =
      {http://www.uni-bayreuth.de/departments/math/org/mathe7/DISTR/distr.pdf},
    pdf = {http://CRAN.R-project.org/doc/Rnews/Rnews_2006-2.pdf},
  }
  @Article{,
    title = {General Purpose Convolution Algorithm in {S}4 Classes by
      Means of FFT},
    author = {Peter Ruckdeschel and Matthias Kohl},
    journal = {Journal of Statistical Software},
    year = {2014},
    volume = {59},
    number = {4},
    pages = {1--25},
    url = {http://www.jstatsoft.org/v59/i04/},
  }