Vignaud, H., & Toscanelli, P. d. P. (1902). Toscanelli and Columbus: The letter and chart of Toscanelli on the route to the Indies by way of the west, sent in 1474 to the Portuguese, Fernam Martins, and later on to Christopher Columbus. London: Sands.

Vignaud, Henry, and Paolo del Pozzo Toscanelli. Toscanelli and Columbus: The Letter and Chart of Toscanelli On the Route to the Indies By Way of the West, Sent in 1474 to the Portuguese, Fernam Martins, and Later On to Christopher Columbus. London: Sands, 1902.

Vignaud, Henry, and Paolo del Pozzo Toscanelli. Toscanelli and Columbus: The Letter and Chart of Toscanelli On the Route to the Indies By Way of the West, Sent in 1474 to the Portuguese, Fernam Martins, and Later On to Christopher Columbus. London: Sands, 1902.