diff --git a/reference-docs.md b/reference-docs.md
index d176995..fd1a5d2 100644
--- a/reference-docs.md
+++ b/reference-docs.md
@@ -1,9 +1,12 @@
-.. _references:
+# Reference websites, documents, and books
 
-A Reference of References
-=========================
+*A Reference of References*
 
-Regular Expressions
--------------------
+## Regular Expressions
+
+  * [Regexr.com](https://regexr.com/ )
+
+## Firefox
+
+  * [Firefox and the "about" protocol - Mozilla](https://developer.mozilla.org/en-US/docs/Mozilla/Firefox/The_about_protocol )
 
-https://regexr.com/