I've been thinking that I need a good reference for HTML/CSS. So, I thought I'd grab the twinpack of HTML/CSS Reference hardcovers you've got. Though I can add the HTML one, when I click to add the CSS reference it doesn't do so...the only thing that shows up is the HTML one. Yet the CSS reference is advertised and nowhere on the page did I see that it was unavailable? I'm a bit confused can someone enlighten me?