"History and Chronology of the Eighteenth Dynasty of Egypt: Seven Studies", Donald B. Redford. University of Toronto Press, 1967.

Now one of the grand old men of Egyptology, Donald published this book when he was one of the field's rising young Turks. Before this book came out, many Egyptologists believed Amenhotep III and Akhenaten ruled together as co-regents. This book made a good case against the theory and pointed out that Akhetaten always associated himself with his dad, but you never saw the reverse. Later though Donald had to give in a bit and say Amenhotep abdicated his throne and so was still alive when Akhenaten became king. Others, however, don't buy the abdication scenario since how the heck could a god abdicate? So now the co-regency question seems to be more of to what degree Amenhotep continued to be active after Akhetaten became king.

Highly readable but now difficult to find and used copies are not cheap.