R – ASP.NET User Control

I have this user control:

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="cite.ascx.cs" Inherits="cite" %>

with behind code:

[ParseChildren(typeof(Reference), DefaultProperty = "References", ChildrenAsProperties = true)]
public partial class cite : System.Web.UI.UserControl {

    public cite() {
        this.References = new ReferenceCollection();
    }

    [PersistenceMode(PersistenceMode.InnerProperty)]
    public ReferenceCollection References { get; private set; }

    protected override void Render(HtmlTextWriter writer) {
        writer.Write("<ul>");
        this.References.ForEach(reference => reference.Render(writer));
        writer.Write("</ul>");
    }
}

public class ReferenceCollection : List<Reference> { }

public abstract class Reference {
    public string Title { get; set; }
    public abstract void Render(HtmlTextWriter writer);
}

public class Book : Reference {
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public int Edition { get; set; }
    public string Place { get; set; }
    public string LocalTitle { get; set; }
    public int LocalPublished { get; set; }
    public string ISBN { get; set; }
    public int Page { get; set; }

    public override void Render(HtmlTextWriter writer) {
        writer.Write(string.Format("<li><cite><span style=\"text-transform: uppercase;\">{0}</span>, {1}. <i>{3}</i>. {4}. vyd. {5} : {6}, {7}. ISBN {8} S. {9}.</cite></li>", LastName, FirstName, Title, Edition, Place, LocalTitle, LocalPublished, ISBN, Page));
    }
}

public class Web : Reference {
    public string Site { get; set; }
    public DateTime Published { get; set; }
    public DateTime Cited { get; set; }
    public Uri URL { get; set; }

    public override void Render(HtmlTextWriter writer) {
        writer.Write(string.Format("<li><cite><i>{0}</i> [online]. {1}, {2}, [cit. {3}]. URL: &lt;<a href=\"{4}\" rel=\"nofollow\" style=\"text-decoration: none; color: black;\">{4}</a>&gt;", Title, Site, Published.ToSlashedString(), Cited.ToSlashedString(), URL));
    }
}

and I call it like this:

<asp:references runat="server">
    <asp:Web Title="F-14 Tomcat" Site="Wikipedia" Published="2005-09-23" Cited="2005-10-08" URL="http://en.wikipedia.org/w/index.php?title=F-14_Tomcat&oldid=19416063" />
    <asp:Book FirstName="David" LastName="Donald" Title="The Pocket Guide to Military Aircraft and the World's Airforces" Edition="1" Place="Praha" LocalTitle="Kapesní encyklopedie Vojenská letadla" LocalPubliched="2002" ISBN="80-7181-701-5" Page="76" />
</asp:references>

Control is also registered in web.config file. But <asp:Web /> and <asp:Book /> tags are unknown. I want just parse inner content of user control, create instances of classes (Web or Book) and add them to the control's References property.