update bib

packages.bib

@@ -3,26 +3,83 @@ @Manual{R-base
   author = {{R Core Team}},
   organization = {R Foundation for Statistical Computing},
   address = {Vienna, Austria},
-  year = {2018},
+  year = {2020},
   url = {https://www.R-project.org/},
 }
+
 @Manual{R-bookdown,
   title = {bookdown: Authoring Books and Technical Documents with R Markdown},
   author = {Yihui Xie},
-  note = {R package version 0.7.15},
+  note = {R package version 0.21.4},
   url = {https://github.com/rstudio/bookdown},
-  year = {2018},
+  year = {2020},
 }
+
 @Manual{R-knitr,
   title = {knitr: A General-Purpose Package for Dynamic Report Generation in R},
   author = {Yihui Xie},
-  year = {2018},
-  note = {R package version 1.20},
-  url = {https://CRAN.R-project.org/package=knitr},
+  note = {R package version 1.30.2},
+  url = {https://yihui.org/knitr/},
+  year = {2020},
 }
+
 @Manual{R-rmarkdown,
   title = {rmarkdown: Dynamic Documents for R},
   author = {JJ Allaire and Yihui Xie and Jonathan McPherson and Javier Luraschi and Kevin Ushey and Aron Atkins and Hadley Wickham and Joe Cheng and Winston Chang and Richard Iannone},
-  note = {https://rmarkdown.rstudio.com, https://github.com/rstudio/rmarkdown},
+  year = {2020},
+  note = {R package version 2.5},
+  url = {https://github.com/rstudio/rmarkdown},
+}
+
+@Book{bookdown2016,
+  title = {bookdown: Authoring Books and Technical Documents with {R} Markdown},
+  author = {Yihui Xie},
+  publisher = {Chapman and Hall/CRC},
+  address = {Boca Raton, Florida},
+  year = {2016},
+  note = {ISBN 978-1138700109},
+  url = {https://github.com/rstudio/bookdown},
+}
+
+@Book{knitr2015,
+  title = {Dynamic Documents with {R} and knitr},
+  author = {Yihui Xie},
+  publisher = {Chapman and Hall/CRC},
+  address = {Boca Raton, Florida},
+  year = {2015},
+  edition = {2nd},
+  note = {ISBN 978-1498716963},
+  url = {https://yihui.org/knitr/},
+}
+
+@InCollection{knitr2014,
+  booktitle = {Implementing Reproducible Computational Research},
+  editor = {Victoria Stodden and Friedrich Leisch and Roger D. Peng},
+  title = {knitr: A Comprehensive Tool for Reproducible Research in {R}},
+  author = {Yihui Xie},
+  publisher = {Chapman and Hall/CRC},
+  year = {2014},
+  note = {ISBN 978-1466561595},
+  url = {http://www.crcpress.com/product/isbn/9781466561595},
+}
+
+@Book{rmarkdown2018,
+  title = {R Markdown: The Definitive Guide},
+  author = {Yihui Xie and J.J. Allaire and Garrett Grolemund},
+  publisher = {Chapman and Hall/CRC},
+  address = {Boca Raton, Florida},
   year = {2018},
+  note = {ISBN 9781138359338},
+  url = {https://bookdown.org/yihui/rmarkdown},
+}
+
+@Book{rmarkdown2020,
+  title = {R Markdown Cookbook},
+  author = {Yihui Xie and Christophe Dervieux and Emily Riederer},
+  publisher = {Chapman and Hall/CRC},
+  address = {Boca Raton, Florida},
+  year = {2020},
+  note = {ISBN 9780367563837},
+  url = {https://bookdown.org/yihui/rmarkdown-cookbook},
 }
+