If so, beware. Perhaps you should read books by Professor B before making any conclusions. If so, perhaps the author has an axe to grind. If you are interested in a controversial area in science, try to read more than one book on the subject. But be sure, before you start, that there is really controversy to begin with.
Some authors claim controversy where none exists, where the issue has been decided for many years.
One way to tell is to count the number of books for and against the position at a major mainstream bookstore, such as Border's or Barnes and Noble. If there are thirty books for, and only one or two against, that should tell you what the current scientific consensus is. For example, it has been known for more than a hundred years that it is impossible to square the circle, but books claiming a solution still appear from time to time. Look carefully at the words used by the author. There are also several collections of writings about pseudoscience.