Fifth Edition. As you know, these editions don't change much from year to year but if you have onr more than 2 or 3 editions old, this may be right for you. Produced in 2013. Top corner on front of book at spine has some damage (it was dropped). Otherwise perfectly clean, near new with bright, tight pages and no spine crease. Large paperback - 8 1/2 X 11" with 589 pages.