diff --git a/manuscript/09-contribute.Rmd b/manuscript/09-contribute.Rmd
index 0e4d46da9..b988da7c1 100644
--- a/manuscript/09-contribute.Rmd
+++ b/manuscript/09-contribute.Rmd
@@ -14,25 +14,24 @@ If you found this book useful for your blog post, research article or product, I
 You can cite the book like this:
 
 
-
-    Molnar, C. (2022). Interpretable Machine Learning:
-    A Guide for Making Black Box Models Explainable (2nd ed.).
-    christophm.github.io/interpretable-ml-book/
-
+```
+Molnar, C. (2022). Interpretable Machine Learning:
+A Guide for Making Black Box Models Explainable (2nd ed.).
+christophm.github.io/interpretable-ml-book/
+```
 
 Or use the following bibtex entry:
 
-
-
-    @book{molnar2022,
-      title      = {Interpretable Machine Learning},
-      author     = {Christoph Molnar},
-      year       = {2022},
-      subtitle   = {A Guide for Making Black Box Models Explainable},
-      edition    = {2},
-      url = {christophm.github.io/interpretable-ml-book/}
-    }
-
+```
+@book{molnar2022,
+  title      = {Interpretable Machine Learning},
+  author     = {Christoph Molnar},
+  year       = {2022},
+  subtitle   = {A Guide for Making Black Box Models Explainable},
+  edition    = {2},
+  url = {christophm.github.io/interpretable-ml-book/}
+}
+```
 
 I am always curious about where and how interpretation methods are used in industry and research.
 If you use the book as a reference, it would be great if you wrote me a line and told me what for.