diff --git a/packages.bib b/packages.bib
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+@Manual{R-base,
+  title = {R: A Language and Environment for Statistical Computing},
+  author = {{R Core Team}},
+  organization = {R Foundation for Statistical Computing},
+  address = {Vienna, Austria},
+  year = {2016},
+  url = {https://www.R-project.org/},
+}
+@Manual{R-bookdown,
+  title = {bookdown: Authoring Books with R Markdown},
+  author = {Yihui Xie},
+  note = {R package version 0.0.63},
+  url = {https://github.com/rstudio/bookdown},
+  year = {2016},
+}
+@Manual{R-knitr,
+  title = {knitr: A General-Purpose Package for Dynamic Report Generation in R},
+  author = {Yihui Xie},
+  year = {2016},
+  note = {R package version 1.12.22},
+  url = {http://yihui.name/knitr/},
+}
+@Manual{R-rmarkdown,
+  title = {rmarkdown: Dynamic Documents for R},
+  author = {JJ Allaire and Joe Cheng and Yihui Xie and Jonathan McPherson and Winston Chang and Jeff Allen and Hadley Wickham and Aron Atkins and Rob Hyndman},
+  year = {2016},
+  note = {R package version 0.9.5.9},
+  url = {http://rmarkdown.rstudio.com},
+}