Here are some of his notable works:
* "The South in American History" (1960): This textbook, co-authored with William C. Havard, became a standard text for studying Southern history for many years.
* "The Confederate Leadership: A Study in Political and Military Affairs" (1953): This book examines the leadership of the Confederacy, analyzing their strategies, weaknesses, and the impact of their decisions.
* "Johnson and Reconstruction" (1964): This work focuses on the Reconstruction era and the presidency of Andrew Johnson, exploring his policies and their impact on the South.
* "The Governors of Alabama" (1972): This comprehensive history covers the lives and administrations of Alabama's governors, providing valuable insights into the state's political history.
* "Lee's Lieutenants: A Study in Command" (1966): This book examines the key military figures who served under Robert E. Lee during the Civil War, analyzing their strengths and weaknesses.
Summersell's scholarship is characterized by meticulous research, clear writing, and a balanced approach to controversial issues. His works have contributed significantly to our understanding of the South and its history.