Extracting URL value from XML Element

Please help me with the following.

Input xml is..

<Request>
  <Header>
    <References type ="URL">
      <ReferenceNumber>http://ift.tt/1v3rFl7;
    </References>
  </Header>
</Request>

The XSLT is..

<?xml version="1.0" encoding="ISO-8859-1"?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://ift.tt/tCZ8VR">
  <xsl:template match="/">
        <xsl:value-of select="Request/Header/References/ReferenceNumber"/>
  </xsl:template>
</xsl:stylesheet>

This XSLT works for everything else but the specified value in ReferenceNumber element as shown above.

Am I missing something?

Thanks in advance, Sashank