To cite RcmdrPlugin.survival in publications use:

Fox J, Carvalho MS (2012). “The RcmdrPlugin.survival Package: Extending the R Commander Interface to Survival Analysis.” Journal of Statistical Software, 49(7), 1–32. doi: 10.18637/jss.v049.i07.

Corresponding BibTeX entry:

  @Article{,
    title = {The {RcmdrPlugin.survival} Package: Extending the {R}
      Commander Interface to Survival Analysis},
    author = {John Fox and Marilia S\'a Carvalho},
    journal = {Journal of Statistical Software},
    year = {2012},
    volume = {49},
    number = {7},
    pages = {1--32},
    doi = {10.18637/jss.v049.i07},
  }