^ Messerli F. H., Loughlin K. R., Messerli A. W., Welch W. R.: The President and the pheochromocytoma. Am J Cardiol 2007; 99: 1325–1329.

^ "Former Presidents Act". National Archives and Records Administration. Archived from the original on June 14, 2008. Retrieved May 23, 2008.

^ Nixon, Richard, The Memoirs of Richard Nixon, 1978, pp. 222–223.

^ Jump up to: a b c "Dwight D. Eisenhower Farewell Address". USA Presidents. Archived from the original on May 13, 2008. Retrieved May 23, 2008.

^ Post Presidential Years Archived January 14, 2009, at the Wayback Machine. Eisenhower Archives. "President Kennedy reactivated his commission as a five star general in the United States Army. With the exception of George Washington, Eisenhower is the only United States President with military service to reenter the Armed Forces after leaving the office of President."^ "John F. Kennedy Presidential Library & Museum, A Chronology from The New York Times, March 1961". March 23, 1961. Archived from the original on May 3, 2006. Retrieved May 30, 2009. Mr. Kennedy signed into law the act of Congress restoring the five-star rank of General of the Army to his predecessor, Dwight D. Eisenhower. 