This is one of those poorly researched self published E-books that they just took and pressed out a few quick hard copies of with no regard for editing (they still refer to it as an E-book in the copyright section for Pete's sake) or formatting. A quick giveaway of these kinds of books is the very cheap feeling material for the cover and paper, lack of any title on the spine, and poorly formatted text, (weird margins or typeface, lots of typos, etc), and the overly long names (probably either due to poor attention to detail in the listing or in an attempt to maximize the likelihood that it will show up in a search from having so many relevant words.)
This style of book is basically a scam, the "author" will cull some information on a subject, which could be anything from how to learn French, how to cook, diet, cope with anxiety, etc, off of Wikipedia or other easy resources and compile it. They don't have any expertise or authority on the subject. A quick search for the name listed here (Brian Adams) or the name listed on the cover of the book (Angel Greene) will show they have no reputation in either the field of psychology or literature. I wouldn't be surprised if these weren't even real people.
Some of the information in the book might very well be helpful, but you'd get the same information by just googling "how to deal with social anxiety." If you want something a little more in depth than an online article, you need a book from a reputable psychologist.