<!-- By reference -->
<label for="first_name">First Name</label>
<input type="text" id="first_name" name="first_name">
<!-- By wrapping -->
<label>First Name
<input type="text" name="first_name">
</label><label for="id_of_what_you're_labeling"></label>
<!-- for example-->
<label for="username"></label>
<input type="text" id="username"><!DOCTYPE html>
<html>
<head>
<title>Title of the document</title>
</head>
<body>
<form>
<label for="lfname">First name:</label>
<input id="lfname" name="fname" type="text" />
</form>
</body>
</html><%= f.input :source_type, :label => "Label Answer" %>