I'm pretty sure you can link to anything you want no problem and even use an image from the site as long as you link back to them. I would write a nice description about the tutorial or even do a tutorial round up and link to 3 great new tutorials you found for a blog post.
Trust me they will appreciate any traffic you send them. Just don't copy and paste their tutorial on your site or copy a bunch of text they wrote. using small quotes is fine but not to much or it might be marked as duplicate content by search engines.
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