To cite package 'pvsR' in publications use:

Ulrich Matter (2013). pvsR: An R package to interact with the Project Vote Smart API for scientific research. R package version 0.1.1. http://CRAN.R-project.org/package=pvsR

Corresponding BibTeX entry:

  @Manual{,
    title = {pvsR: An R package to interact with the Project Vote Smart
      API for scientific research},
    author = {Ulrich Matter},
    year = {2013},
    note = {R package version 0.1.1},
    url = {http://CRAN.R-project.org/package=pvsR},
  }