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 PITCHf/x. R package version 1.7.

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 PITCHf/x},
    author = {Carson Sievert},
    year = {2015},
    note = {R package version 1.7},
    url = {http://cpsievert.github.com/pitchRx},
  }