injecting into admincp settings?

[Dr.CustUmz]

im trying to include a stylesheet in my settings page, i managed to get it to load in but not in a good way. It adds the code to the very end of the page.

</body>
</html><link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/font-awesome/4.6.1/css/font-awesome.min.css">

the plugin I created:

<plugin active="1" executionorder="1" product="vbulletin">
      <title>font awesome in settings</title>
      <hookname>admin_complete</hookname>
      <phpcode><![CDATA[if ($vbulletin->options['drc_fa_adm']){
   echo('<link rel="stylesheet" href="'.$vbulletin->options['drc_fa_prov'].'">');
}]]></phpcode>
	</plugin>

even though this works, I would like to know... is there anyway i can properly inject stylesheets and/or scripts into the settings page?