Let us look at some classics today. And with a very good price, too... I have refrained from giving a suggestion because the price at Amazon was at 900 USD (!!!), but I am happy to mention one of the greatest books on declarer play for only 2 bucks.
As always, take the bidding sequences in these books with many grains of salt. The greatest change in bridge regards the styles of bidding (not necessarily the systems) -- the modern game is much more active. Suspend your disbelief when it comes to the bidding and enjoy the fantastic things you will learn about declarer play and defense.
The first exhibit is the great Master Play (a.k.a. The Expert Game -- don't ask. It has to do with different publishers in the UK and the USA), by Terence Reese. Useful concepts presented in the very enjoyable writing of one of the greatest bridge authors ever.
(This price will not last forever. Look for it under the name of The Expert Game if you are out of luck).
The second suggestion for today was also revolutionary. It was the first advanced book on defense. You will see emphasized the virtues of counting everything, visualizing declarer's hand, helping partner, and more. Get ready for some strange bidding sequences (and 4-card majors), but once you go past that hurdle, the book is amazing. Enjoy Hugh Kelsey's "Killing Defense".