О Диггесе см.: Johnson & Larkey. Thomas Digges, the Copernican System (1934); Ash. A Perfect and an Absolute Work (2000); и Collinson. The Monarchical Republic (1987). О Хэрриоте см.: Fox (ed.). Thomas Harriot (2000); Schemmel. The English Galileo (2008); и Greenblatt, Invisible Bullets (1988).