Hi reflection,

As long as it's not going to a website that violates the rules of PsychCentral, and providing you clearly identify what the link is going to - then go right ahead. The Community Guidelines prohibit you from advertising your own resource, book or website, and don't allow advertisements - but providing that you're linking to information on a book, I don't see how it could be an issue. (Otherwise, you can provide the book title and author, and people can search for it themselves!)

When in doubt, you can always PM a moderator or administrator to review your post to make sure it's okay.

I hope that helps!