Problems calling CSS in a PHP page

Hiya guys!
I’m a newbie on wordpress but I know bases about html & css.
Well, I’m working on a website using wordpress just for the news & obviously I use a CSS for styles etc. but I don’t know how to call my css file in the PHP index.

I tried to use this:

<link rel=”stylesheet” href=”<?php bloginfo(‘stylesheet_url’); ?>” type=”text/css” media=”screen” />

but then my page becomes completely white!

In what am I wrong?

ps. sorry if I did mistakes to say that, I’m not perfect with english :S