I've done a bit of reading on the topic.
The most comprehensive look at the evolution of modern amphibious operations is Isley and Crowl's
The U.S. Marine Corps and Amphibious Warfare: Its Theory and Practice in the Pacific. This volume appears to be getting harder to get, but you should be able to find a used copy.
The Marines always get the headlines for their developments in Amphibious techniques during the interwar period. This is because they did do a significant amount of Force Development in the 1930s, and its an interesting period to read about. They were not, however, the service that ironed out all the bugs. This was the US and British Armies in the European Theatre. Remember, by the time the Marines are perfecting amphibious operations in 1944, the Allies had already conducted major landings in North Africa, Sicily, and Italy and the Normandy landings were well into the planning phase. Digging around the official histories of the US Army in World War II to see how these operations were planned would be worth your time.
Probably the best memoir to read is Lucien Truscott's
Command Missions. His story in the Second World War is fascinating, but he doesn't get the press that some of the bigger names do. Truscott was the U.S. LO at Dieppe, created the U.S. Army Rangers, and commanded in the amphibious landings in North Africa, Sicily, Italy, and Southern France at the Task Force, Division, Corps, and Army level. There is probably few, if any, Second World War commanders with the depth and breadth of amphibious experience as Truscott. His memoir is really well written, and if you can read past the self-promotional parts, it is loaded with learning points.
A good, more recent technical piece is
At the Water's Edge: Defending Against the Modern Amphibious Assault which gives the read a good understanding of the offensive/defensive dynamic and why, throughout history, most amphibious operations were successful. If amphibious assaults are so difficult, why is the historical success rate so high? Compare this to river crossing operations, where I once saw figures that suggested that half of all major river crossings were deemed operational failures.
Finally, the modern amphibious operation begins with Gallipoli. Shop around for some books on this operation. The official history has been republished, and can also be found online in PDF, and is really good as it includes annexes with the actual landing orders the British issued. You can get a sense that the British landing was well organized and thought through - it was what they did after the landing that really led to failure.