Cayet, P.V.P. Chronologie Septenaire de l'Histoire de la Paix Entre les Roys de France et d'Espagne (1605). (Used for original version of play).

Justin. Historiarum Philippicarum. 31. (Used for revised version of play).

Livy.Ab Urbe Condita, [i.e. The History of Rome]. 5.37.25. (Used for revised version of play).

Plutarch. The Lives of the Noble Grecians and Romans. Trans. Thomas North (1595). 'Flaminius.' (Used for revised version of play).

Raleigh, Walter. The History of the World (1614). Bk. 5, Ch. 5, 2-8; Ch. 6, 2. (Used for revised version of play).

Teixeira, José. A Continuation of the Lamentable and Admirable Adventures of Dom Sebastian, King of Portugal. Trans. Anthony Munday (?) (1602). (Used for original version of play).

Teixeira, José. The Strangest Adventure that Ever Happened. Trans. Anthony Munday (1601). (Used for original version of play).

Teixeira, José. The True History of the Late and Lamentable Adventures of Don Sebastian, King of Portugal. Trans. anon (1602). (Used for original version of play).

REFERENCE : Philip Edwards and Colin Gibson, eds. The Plays and Poems of Philip Massinger. 4 vols. Oxford: Clarendon Press, 1976. 3.294-8.