<link href="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.3.0/js/bootstrap.min.js"></script>
<script src="//code.jquery.com/jquery-1.11.1.min.js"></script>
<form class="form-horizontal">
<fieldset>
<legend>Source Form</legend>
<div class="form-group">
<label class="col-md-4 control-label" for="source_name">Name</label>
<div class="col-md-4">
<input id="source_name" name="source_name" type="text" placeholder="Source Name" class="form-control input-md">
</div>
</div>
<div class="form-group">
<label class="col-md-4 control-label" for="source_url">URL</label>
<div class="col-md-4">
<input id="source_url" name="source_url" type="text" placeholder="Source URL" class="form-control input-md">
</div>
</div>
<div class="form-group">
<label class="col-md-4 control-label" for="source_description">Description</label>
<div class="col-md-4">
<textarea class="form-control" id="source_description" name="source_description"></textarea>
</div>
</div>