Book Hooked post on bibliotherapy

http://www.bookhookedblog.com/2014/06/ivive-ive-been-hearing-lot-lately-about.html?showComment=1403653122792&m=1#c4004532347750653453

Booked Hooked comments on her instincts regarding bibliotherapy and brings up some good questions in her blog post.
Who do you trust to prescribe books being quite critical...