Bessarion. In calumniatorem Platonis libri quatuor (1503).: A brief biography of Bessarion, and a picture of this book which Bessarion wrote in an effort to reconcile classical philosophy with the Christianity of his time.
Biography.com: Bessarion, John: Very brief article describing the life of this 15th-century scholar.
Johannes Bessarion: Article from the Catholic Encyclopedia on this 15th-century Byzantine scholar, by U. Benigni.
Johannes Bessarion: Wikipedia article, drawn from the 1911 Encyclopedia Britannica.
Letter of Recommendation for Pietro del Sacco of Verona: Partial Latin text and description of this manuscript written for Bessarion by his secretary.