To cite cpm in publications use:

Gordon J. Ross (2015). Parametric and Nonparametric Sequential Change Detection in R: The cpm Package. Journal of Statistical Software, 66(3), 1-20. URL http://www.jstatsoft.org/v66/i03/.

Corresponding BibTeX entry:

  @Article{,
    title = {Parametric and Nonparametric Sequential Change Detection
      in {R}: The {cpm} Package},
    author = {Gordon J. Ross},
    journal = {Journal of Statistical Software},
    year = {2015},
    volume = {66},
    number = {3},
    pages = {1--20},
    url = {http://www.jstatsoft.org/v66/i03/},
  }