Three starting books for Operation Neptune and Normandy

What three books best introduce the planning, buildup, and action of Operation Neptune?

Begin with Ramsay at War, John Buckley's Normandy Campaign: 60 Years On, and John Keegan's Six Armies in Normandy, then compare them with newer accounts such as James Holland's.

David Woodward's Ramsay at War is the starting point for the naval planning and command story. John Buckley's Normandy Campaign: 60 Years On and John Keegan's Six Armies in Normandy widen the view to the land campaign and coalition armies. James Holland is also recommended, with the important advice to pair historians whose different perspectives produce a more complete account.