You can.
But that doesn't always mean that you should.
I imagine that each book has trademarks and/or copyrights along with licensing, as long as you follow those, then you should be able to post with the proper citation, just like if you were writing a research paper you would be bound by MLA or APA rules for Citation.
Anything posted on Stack Exchange sites is posted under CC By-SA 3.0 with Attribution Required
Most of the time if you cite the work properly, you can post it wherever you like while following the advice you were given on your Law Post
- is what was taken an insignificant amount of the entire work?
- is reference made to the original work?
- is your work transformative, changing the original into something new?
- is your purpose non-commercial, that is, not one aimed at deriving directly related economic benefits?
If you can safely answer "yes" to all of the above, you're safe.
Bottom Line:
You should describe the problem in your own words and link back to the problem as both attribution, and so others can find the source.
or (at your own risk)
Make sure to cite your source appropriately according to the source's Copyright/Trademark/Licensing.
If your post violates the Author's/Publisher's rights under any Trademark/Copyright/License/Terms and Conditions, it will be removed.