Franklin D. Roosevelt (2008). “Fireside chats of Franklin Delano Roosevelt: radio addresses to the American people about the Depression, the New Deal, and the Second World War, 1933-1944”, Red & Black Pub
Marcus Aurelius (Emperor of Rome), James Thomson (gent.) (1766). “The Commentaries of the Emperor Marcus Antoninus. Translated from the Greek, by Mr. Thomson”, p.99
Robert Hooke (1906). “Extracts from Micrographia: Or, Some Physiological Descriptions of Minute Bodies Made by Magnifying Glasses with Observations and Inquiries Thereupon”