J. P. Kirsch, "Simplicius, Pope St." Catholic Encyclopedia. Vol. XIV. New York: Appleton. 1912. pp. 2–3.
Karl Joseph von Hefele (1895). W. R. Clark (ed.). A History of the Councils of the Church, from the Original Documents. Vol. IV. Edinburgh: T. & T. Clark. pp. 26–29. In a letter which Thiel (pp. 189-192) dated to October 477, Pope Simplicius wrote to the Patriarch Acacius about what he thought should be done about the heretic bishops.
Pennacchio, Maria Cristina (2000). "Simplicio, santo": "La sua memoria liturgica, indicata dal Martyrologium Romanum al 2 marzo, dal 1971 viene celebrata il 10 marzo."
