Do not make suggestions to spouse for books for them to read. It will come across as pushy, and be counter-productive to you. At best, if you can find a decent book for them that would be good, maybe, and I say maybe, just leave it where it could be found. And DB and DR are very much the same book, DR is just an updated version, do not hand over DB as you may as well be giving your spouse all of your ammo and "game plans".