Magento : Add external JS & CSS from layout

here example layout script how to add external JS & CSS link use Magento way 😉

<reference name="head">
    <block type="core/text" name="your_external_url">
        <action method="setText">
            <text><![CDATA[
		<!-- ADD EXTERNAL JS/CSS or any miscellaneous script here-->
		<script type="text/javascript" src="//cdnjs.cloudflare.com/ajax/libs/jqueryui/1.12.1/jquery-ui.js"></script>
		<link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/jqueryui/1.12.1/jquery-ui.css" />
	   ]]></text>
        </action>
    </block>
    <action method="addLinkRel">
        <rel>stylesheet</rel>
        <href>//cdnjs.cloudflare.com/ajax/libs/jqueryui/1.12.1/jquery-ui.css</href>  <!-- ADD EXTERNAL CSS -->
       
    </action>
</reference>