Wat are the major books that I have to study to get my m.D. In obstetrics and gynecology?

Not all in books. When you're studying under an obstetrician they will have their favorite texts and videos. But first you get your M.D. Then you do a training in obstetrics and gynecology. Congratulations on your goal. Assisting mothers to deliver their babies has been the favorite part of my general practice career. I took my wife to a remote island to meet a "baby" I delivered there 38 years ago. Very emotional.