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Sifri, Costi D.; Madoff, Lawrence C. (2015-01-01), Bennett, John E.; Dolin, Raphael; Blaser, Martin J. (eds.), "80 - Appendicitis", Mandell, Douglas, and Bennett's Principles and Practice of Infectious Diseases (Eighth Edition), Philadelphia: W.B. Saunders, pp. 982–985.e1, doi:10.1016/b978-1-4557-4801-3.00080-1, ISBN978-1-4557-4801-3, retrieved 2020-12-15