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 <li><code>S</code> to save a screenshot to the current directory, in a file <code>shadername_frame_date_time.png</code></li>
 </ul>
 <h1>Limitations</h1>
-<p>For now, the "buffer" shader (i.e. the additional shader that renders in a texture in another framebuffer) does not work properly. I don't understand exactly what's broken, but maybe I'll investigate it more closely later. If you have any idea about what went wrong, don't hesitate to notify me! </p>
+<p>For now, the "buffer" shader (i.e. the additional shader that renders in a texture in another framebuffer) does not work properly. I don't understand exactly what's broken, but maybe I'll investigate it more closely later. If you have any idea about what went wrong, don't hesitate to notify me!</p>
+<h1>References and other resources</h1>
+<ul>
+<li><a href="https://learnopengl.com/">LearnOpenGL</a></li>
+<li><a href="https://open.gl/">open.gl</a></li>
+<li><a href="http://docs.gl/">docs.gl</a></li>
+<li><a href="https://thebookofshaders.com/">The Book of Shaders</a></li>
+<li><a href="https://github.com/patriciogonzalezvivo/glslViewer">glslViewer</a>, a much more complete project with similar aims</li>
+<li><a href="https://www.shadertoy.com/">Shadertoy</a></li>
+<li><a href="https://smoothstep.io/">smoothstep.io</a></li>
+<li><a href="https://github.com/stegu/webgl-noise/">webgl-noise</a>, a collection of reference implementations of noise functions, for use in shaders </li>
+</ul>
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