To cite gRbase in publications use:

Claus Dethlefsen, Søren Højsgaard (2005). A Common Platform for Graphical Models in R: The gRbase Package. Journal of Statistical Software, 14(17), 1-12. URL http://www.jstatsoft.org/v14/i17/.

Corresponding BibTeX entry:

  @Article{,
    title = {A Common Platform for Graphical Models in {R}: The
      {gRbase} Package},
    author = {Claus Dethlefsen and S{\o}ren H{\o}jsgaard},
    journal = {Journal of Statistical Software},
    year = {2005},
    volume = {14},
    number = {17},
    pages = {1--12},
    url = {http://www.jstatsoft.org/v14/i17/},
  }