Duncan, T. B. (1972). Atlantic Islands; Madeira: The Azores, and the Cape Verdes in seventeenth-century commerce and navigation. Chicago: University of Chicago Press.

Duncan, T. Bentley. Atlantic Islands; Madeira: The Azores, and the Cape Verdes in Seventeenth-century Commerce and Navigation. Chicago: University of Chicago Press, 1972.

Duncan, T. Bentley. Atlantic Islands; Madeira: The Azores, and the Cape Verdes in Seventeenth-century Commerce and Navigation. Chicago: University of Chicago Press, 1972.