Both released books and downloadable ebooks usually have masses of online reviews that you can read. For printed books, the Amazon website is an excellent source of reviews. You may also find inexpensive used copies there.
If you are looking at ebooks, many currency exchange forums carry a review section where members post what they thought of the newest foreign exchange systems, robots and ebooks that are available online. Paper reviewers are typically pros in the subject while online client reviews are written by members of the public who might not be informed at all . Always keep in mind that the person may have very different ideas, expectancies or experience than you. Try to find reviews from folks whose situation is close to your own and remember that this is only one person’s point of view about the foreign exchange trading books.