References

• Hadley Wickham, Winston Chang, (2013) devtools: Tools to make developing R code easier. http://CRAN.R-project.org/package=devtools
• Samy Pessé, Aaron O'Mullan, (2014) Gitbook: Build beautiful interactive books using GitHub/Git and Markdown. http://www.gitbook.io/
• Carl Boettiger, (2014) knitcitations: Citations for knitr markdown files. http://CRAN.R-project.org/package=knitcitations