Here's my take on the Word macro books available today, including short capsule reviews and buy recommendations. But first, some background on why there are so few quality books on writing macros for Microsoft Word. Clicking the link opens a new browser window, where you can read more about the book. The computer book industry has gone through tumultuous change in the last few years. The situation is even worse for WordPerfect.
Book selling is a matter of shelf space.
Bookstores want to see each linear foot of their shelves generate a certain amount of money per month. Now, computer books are routinely returned to the publisher if they aren't sold within 45-60 days. The net result is that advanced books about using applications software are becoming more and more rare. Books on advanced topics, like macro writing, are even less common. That was with a certified user base of about 20 million.