McEntire, Madison. Big League Trivia; Facts, Figures, Oddities, and Coincidences from our National Pastime. Bloomington, IN: AuthorHouse. p. IX and 53. ISBN 1-4259-1292-3. Retrieved 4 September 2015.
Jackson, Frank. "Ultimate slam: game over". Hardball Times. September 11, 2013. Retrieved 4 September 2015. "No. 6: 09/11/1955, County Stadium. Hitter: Del Crandall. Pitcher: Herm Wehmeier. Braves 5, Phils 4. This was the first (of 15) ultimate slams with two outs, which would seem to make it a little more special than its predecessors."
Steigerwald, John. "This Was Clemente's Grandest Slam". The Indiana Gazette. July 23, 2006. Retrieved 4 September 2015. "Em julho de 25,1956 , Roberto Clemente fez algo que pode ter sido feito apenas uma vez na história do beisebol. E eu estava lá para ver. "