To cite gRapHD in publications use:

Gabriel C. G. Abreu, David Edwards, Rodrigo Labouriau (2010). High-Dimensional Graphical Model Search with the gRapHD R Package. Journal of Statistical Software, 37(1), 1-18. URL http://www.jstatsoft.org/v37/i01/.

Corresponding BibTeX entry:

  @Article{,
    title = {High-Dimensional Graphical Model Search with the {gRapHD}
      {R} Package},
    author = {Gabriel C. G. Abreu and David Edwards and Rodrigo
      Labouriau},
    journal = {Journal of Statistical Software},
    year = {2010},
    volume = {37},
    number = {1},
    pages = {1--18},
    url = {http://www.jstatsoft.org/v37/i01/},
  }