Custom fields for post.php??

Does anyone know how possible a hack for creating multiple Post contents from the admin area? In my site I have something like this:
date:
<?php the_date()?>
description:
<?php the_content() ?>
And I want to add other fields like:
references:
<?php custom_field() ?>
So that when you write an article you write in custom content and it will integrate into your site how you want. Anyone know a good way to go about this?