To cite package 'RPublica' in publications use:

Thomas J. Leeper (2014). RPublica: ProPublica API Client. R package version 0.1.1.

Corresponding BibTeX entry:

  @Manual{,
    title = {RPublica: ProPublica API Client},
    author = {Thomas J. Leeper},
    year = {2014},
    note = {R package version 0.1.1},
  }