Unfortunately, page numbers are not stable across print editions (due to slight formatting changes), although section numbers, equation numbers, and figure numbers are. (You can tell which printing you have as follows: Check the inside cover, below the "Library of Congress" information. If it says "10 9 8 ... 1" you've got the first print run. If it says "10 9 8 ... 2" you've got the second, etc.) So when citing something in the book, it is better to say "See section X" rather than "See page Y".