To cite gRim in publications use:

Højsgaard S, Edwards D, Lauritzen S (2012). Graphical Models with R. Springer, New York. doi:10.1007/978-1-4614-2299-0, ISBN 978-1-4614-2298-3.

Corresponding BibTeX entry:

  @Book{,
    title = {Graphical Models with {R}},
    author = {S{\o}ren H{\o}jsgaard and David Edwards and Steffen
      Lauritzen},
    publisher = {Springer},
    address = {New York},
    year = {2012},
    note = {ISBN 978-1-4614-2298-3},
    doi = {10.1007/978-1-4614-2299-0},
  }