(en) Bailey W. Diffie et George D. Winius, Foundations of the Portuguese empire, vol. 1, Minneapolis, University of Minnesota Press, , 533 p. (ISBN0-8166-0782-6, lire en ligne), page 464.
(en) James Alexander Williamson, The Cabot Voyages and Bristol Discovery under Henry VII, Londres, Hakluyt Society at the University Press, , 332 p. (ISBN0-8166-0782-6, lire en ligne), pages 98, 120-1, 312-7.