Froude, James Anthony (1896). English Seamen in the Sixteenth Century. New York: Charles Scribner's Sons. Quote: "He told Camden that he was of mean extraction. He meant merely that he was proud of his parents and made no idle pretensions to noble birth. His father was a tenant of the Earl of Bedford, and must have stood well with him, for Francis Russell, the heir of the earldom, was the boy's godfather."
Wallis, Helen (1984). „The Cartography of Drake's Voyage”. Ур.: Norman J. W. Thrower. Sir Francis Drake and the Famous Voyage, 1577–1580: Essays Commemorating the Quadricentennial of Drake's Circumnavigation of the Earth. University of California Press. стр. 143. ISBN978-0-520-04876-8.