Updating README

README.md

@@ -1,8 +1,12 @@
 # Simple web app for Pluralsight courses and Docker Deep Dive book
-This is a quick and dirty node.js app cobbled together for the purposes of demonstrating how to Dockerize/containerize a simple app.
-
-**This app is maintained approximately once per year so may contain vulnerbilities. Use at own risk**
 
 Exposes web server on port `8080` as per `./app.js`
 
 See `Dockerfile` for more details
+
+Referenced in:
+- [Docker Deep Dive](https://www.amazon.com/Docker-Deep-Dive-Nigel-Poulton/dp/1521822808/ref=tmm_pap_swatch_0?_encoding=UTF8&qid=&sr=) 
+- Getting Started with Docker video course (pluralsight.com)
+
+**The app is maintained approximately once per year so may contain vulnerbilities.**
+