CSS for one static page

Hi all,

i know this question has been asked before, but I still cannot figure this out.

Ik have 1 page called ‘De schoolgids’ that i want to style with a different stylesheet then default.

my schoolgids.css is located in the subfolder /css

I added the following code in my header.php:

<?php if (is_page('De schoolgids')) { ?>
	<link rel="stylesheet" type="text/css" href="<?php bloginfo('template_url'); ?>/css/schoolgids.css" />
	<?php } ?>

For some reason is does not accept this.

What am i doing wrong??