Eugénie de GUÉRIN, François Guillaume Stanislas TRÉBUTIEN (1866). “Letters of E. de G. Edited by G. S. Trébutien. [Translated from the French.]”, p.180
Francis Bacon, John Milton (2010). “Essays, Civil and Moral & the New Atlantis by Francis Bacon: Aeropagitica & Tractate of Education by John Milton, Religio Medici by Sir Thomas Browne”, p.117, Cosimo, Inc.