To cite the 'dirmult' package in publications use:

Tvedebrink T (2010). “Overdispersion in allelic counts and theta-correction in forensic genetics.” Theoretical Population Biology, 78(3), 200–210. http://dx.doi.org/10.1016/j.tpb.2010.07.002.

Corresponding BibTeX entry:

  @Article{,
    title = {Overdispersion in allelic counts and theta-correction in
      forensic genetics},
    author = {Torben Tvedebrink},
    journal = {Theoretical Population Biology},
    year = {2010},
    volume = {78},
    number = {3},
    pages = {200--210},
    url = {http://dx.doi.org/10.1016/j.tpb.2010.07.002},
  }