diff --git a/book.bib b/book.bib
index ac0d02df..831a2ae2 100644
--- a/book.bib
+++ b/book.bib
@@ -192,3 +192,12 @@ @article{anderson
  volume = {23},
  year = {1936}
 }
+
+@book{r-pkgs-book,
+ author = {Wickham, Hadley},
+ title = {R Packages},
+ year = {2015},
+ isbn = {1491910593, 9781491910597},
+ edition = {1st},
+ publisher = {O'Reilly Media, Inc.}
+}