references.bib

@Manual{knitr,
  title = {knitr: A general-purpose package for dynamic report generation in R},
  author = {Yihui Xie},
  year = {2014},
  note = {R package version 1.6},
  url = {http://yihui.name/knitr/},
}
@Manual{knitcitations,
  title = {knitcitations: Citations for knitr markdown files},
  author = {Carl Boettiger},
  year = {2014},
  note = {R package version 0.6-2},
  url = {http://CRAN.R-project.org/package=knitcitations},
}
@Manual{devtools,
  title = {devtools: Tools to make developing R code easier},
  author = {Hadley Wickham and Winston Chang},
  year = {2014},
  note = {R package version 1.5},
  url = {http://CRAN.R-project.org/package=devtools},
}
@Manual{gitbook,
  title = {Gitbook: Build beautiful interactive books using GitHub/Git and Markdown},
  author = {{Samy Pessé and Aaron O'Mullan}},
  year = {2014},
  url = {http://www.gitbook.io/},
}