To cite the R package BRugs in publications use:

Thomas, A., O'Hara, B., Ligges, U., and Sturtz, S. (2006). Making BUGS Open. R News 6 (1), 12-17.

Corresponding BibTeX entry:

  @Article{,
    title = {Making BUGS Open},
    author = {Andrew Thomas and Bob O'Hara and Uwe Ligges and Sibylle
      Sturtz},
    journal = {R News},
    year = {2006},
    pages = {12--17},
    number = {1},
    volume = {6},
    url = {http://cran.r-project.org/doc/Rnews/},
  }