As Joseph and Yan pointed out, the third edition was produced with InDesign.
In my edition (3.1), it says:
For those concerned about such things, I might record that the first edition of this book was set in Ventura Publisher software, the second edition in Quark, and the third in InDesign. With each such shift has come a marked increase in technical capability. I have still, in every case, been obliged at times to subvert the software, forcing it to do things its makers didn't foresee, or things they did foresee and expressly excluded.