diff --git a/README.md b/README.md
index 18961bf..d860a01 100644
--- a/README.md
+++ b/README.md
@@ -3,3 +3,5 @@
  - See the Wiki for a list of known typographical errors, the wiki is at https://github.com/biomathman/machine-learning-in-R-book/wiki
  - Please raise an issue for add a new issue or feature request, issues are at https://github.com/biomathman/machine-learning-in-R-book/issues
  - See the notebooks folder for Jupyter notebooks for the code for each chapter
+ 
+ - You can get copies of the book at: https://gumroad.com/l/wqxzs (PDF) or https://www.amazon.com/dp/0996686045/ (paperback)