To cite boa in publications use:

Smith, B. J. (2007) boa: An R Package for MCMC Output Convergence Assessment and Posterior Inference Journal of Statistical Software, 21(11), 1-37

Corresponding BibTeX entry:

  @Article{,
    title = {boa: An R Package for MCMC Output Convergence Assessment
      and Posterior Inference},
    author = {Brian J. Smith},
    year = {2007},
    journal = {Journal of Statistical Software},
    volume = {21},
    number = {11},
    pages = {1--37},
  }