To cite pitchRx in publications use:

Carson Sievert (2014). Taming PITCHf/x Data with {pitchRx} and {XML2R} The R Journal, 6(1). URL http://journal.r-project.org/archive/2014-1/sievert.pdf.

Carson Sievert (2015). pitchRx: Tools for Harnessing 'MLBAM' 'Gameday' Data and Visualizing 'pitchfx'. R package version 1.8.2.

Corresponding BibTeX entries:

  @Article{,
    title = {Taming PITCHf/x Data with {pitchRx} and {XML2R}},
    author = {Carson Sievert},
    journal = {The R Journal},
    year = {2014},
    volume = {6},
    number = {1},
    url = {http://journal.r-project.org/archive/2014-1/sievert.pdf},
  }

  @Manual{,
    title = {pitchRx: Tools for Harnessing 'MLBAM' 'Gameday' Data and
      Visualizing 'pitchfx'},
    author = {Carson Sievert},
    year = {2015},
    note = {R package version 1.8.2},
    url = {http://cpsievert.github.com/pitchRx},
  }