To cite RcmdrPlugin.survival in publications use:

John Fox, Marilia Sa Carvalho (2012). The RcmdrPlugin.survival Package: Extending the R Commander Interface to Survival Analysis. Journal of Statistical Software, 49(7), 1-32. URL http://www.jstatsoft.org/v49/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},
    url = {http://www.jstatsoft.org/v49/i07/},
  }