Update README.md

Author: mcdev7777

README.md

@@ -3,15 +3,15 @@ A very very simple Battleship game written in plain JavaScript: http://learntoco
 
 Read about the game and its rules here: https://en.wikipedia.org/wiki/Battleship_(game)
 
-## Step 1: Create your files
+### Step 1: Create your files
 
 Useful references:
 - [Final HTML file](https://github.com/LearnToCodeLA/Battleship-JavaScript/blob/gh-pages/index.html)
 - [Final CSS file](https://github.com/LearnToCodeLA/Battleship-JavaScript/blob/gh-pages/style.css)
 - [Final JS file](https://github.com/LearnToCodeLA/Battleship-JavaScript/blob/gh-pages/battleship.js)
 - [CSS Relative and Absolute Positioning](http://learnlayout.com/position.html)
 
-## Step 2: Create a grid on your HTML page for the game board
+### Step 2: Create a grid on your HTML page for the game board
 
 Useful references:
 - [Document.getElementById()](https://developer.mozilla.org/en-US/docs/Web/API/Document/getElementById)
@@ -20,18 +20,19 @@ Useful references:
 - [style property](https://developer.mozilla.org/en-US/docs/Web/API/HTMLElement/style)
 - [Loops in JavaScript](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Loops_and_iteration)
 
-## Step 3: Model the game board in JavaScript and place ships
+### Step 3: Model the game board in JavaScript and place ships
 
 Useful references:
 - [Arrays in JavaScript](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array)
 
-## Step 4: Create event handler and write the game logic
+### Step 4: Create event handler and write the game logic
 
 Useful references:
 - [Events in JavaScript](http://www.kirupa.com/html5/javascript_events.htm)
 - [Handling Events for Many Elements](http://www.kirupa.com/html5/handling_events_for_many_elements.htm)
+- [Handling Events - Eloquent JavaScript Chapter 14](http://eloquentjavascript.net/14_event.html)
 
-## Step 5: Play the game!
+### Step 5: Play the game!
 
 Play the game here: http://learntocodela.github.io/Battleship-JavaScript/