To cite bcp in publications use:

Chandra Erdman, John W. Emerson (2007), bcp: An R Package for Performing a Bayesian Analysis of Change Point Problems, Journal of Statistical Software, 23(3), 1-13, URL http://www.jstatsoft.org/v23/i03/.
Chandra Erdman, John W. Emerson (2008), A Fast Bayesian Change Point Analysis for the Segmentation of Microarray Data, Bioinformatics, 24(19), 2143--2148, URL http://bioinformatics.oxfordjournals.org/cgi/content/abstract/btn404.

Corresponding BibTeX entries:

  @Article{,
    title = {{bcp}: An {R} Package for Performing a Bayesian Analysis
      of Change Point Problems},
    author = {Chandra Erdman and John W. Emerson},
    journal = {Journal of Statistical Software},
    year = {2007},
    volume = {23},
    number = {3},
    pages = {1--13},
    url = {http://www.jstatsoft.org/v23/i03/},
  }
  @Article{,
    title = {A Fast Bayesian Change Point Analysis for the Segmentation
      of Microarray Data},
    author = {Chandra Erdman and John W. Emerson},
    journal = {Bioinformatics},
    year = {2008},
    volume = {24},
    number = {19},
    pages = {2143--2148},
    url =
      {http://bioinformatics.oxfordjournals.org/cgi/content/abstract/btn404},
  }