title: Adding references in Visual Studio 2013
body: <p>I have some problems with adding references. I created Windows Phone project in Visual Studio 2013 and I need to add references <code>System.Web.Extensions</code> to use <code>System.Web.Script.Serialization</code>. </p>
  
  <p><img src="https://i.stack.imgur.com/2OlBh.png" alt="screenshot from vs"></p>
  
  <p>But when I right-click and choose "add reference", there is no such variant in the list, just some namespaces, connected to windows phone developing.</p>
  
  <p>Also, there is an ability to add references to other projects from solution, but here I have the second problem - I can't add reference to simple class library, for example. It says me, that I can just add references to windows phone projects..</p>
  
  <p>So, when can I read about changes in the reference system in VS2013 (and 2012 as I remember)? How to add reference to <code>System.Web.Extensions</code> in my WP project? And is there an ability to use custom class libraries with references in this case?</p>