There are hundreds of books on the subject but here are just a few.
My top three
1 Sand and Steel P.Caddick-Adams
2 Normandy '44 J.Holland (outstanding bibliography)
3 D-Day S.Ambrose (the great American historian of the war)
Seen from a German viewpoint
1 D-Day through German Eyes H.Eckhertz
2 D-Day through German Eyes J.Trigg
Other classics
1 D-Day A.Beevor
2 Overlord M.Hastings
Unusual
D Day Operations Manual Falconer & Watson
Short and Simple
Victory in Europe Karen Farrington (NB D Day to Victory)
Thank you so much for this booklist.and your wonderful lectures.
Barbara Thal-Hodes