[estel]

Quoting parts of the book to support some points made in the article would fall under fair use, but linking to a scan of the entire book would not.

[btilly]

Hosting a scan is not fair use, but linking to a copyright violation is not generally a copyright violation. Though a few courts have ruled that it can be if done for the specific purpose of knowingly disseminating illegal material. See http://www.chillingeffects.org/linking/faq.cgi#QID152 for more.

[estel]

That's true, but the original point was 'poor form', which this likely falls under also.

[ZoFreX]

It may not be illegal, but it's incredibly poor form.