To cite topicmodels in publications use:

Grün B, Hornik K (2011). “topicmodels: An R Package for Fitting Topic Models.” Journal of Statistical Software, 40(13), 1–30. doi: 10.18637/jss.v040.i13.

Corresponding BibTeX entry:

  @Article{,
    title = {{topicmodels}: An {R} Package for Fitting Topic Models},
    author = {Bettina Gr\"un and Kurt Hornik},
    journal = {Journal of Statistical Software},
    year = {2011},
    volume = {40},
    number = {13},
    pages = {1--30},
    doi = {10.18637/jss.v040.i13},
  }