"Becoming a Great School: Harnessing the Powers of Quality Management and Collaborative Leadership". Book by Dr. Kenneth B. Cooper, Nels Gustafson and Joseph G. Salah (p. 9), December 24, 2013.
Immanuel Kant (1900). “Kant's cosmogony as in his essay on the retardation of the rotation of the earth and his Natural history and theory of the heavens: With introduction, appendices, and a portrait of Thomas Wright of Durham”
Quoted in Evan Esar, The Dictionary of Humorous Quotations (1949). Usually attributed to Dewar, but it should be noted that the line "mind like parachute - only function when open!" appears in the 1936 film Charlie Chan at the Circus (screenplay by Robert Ellis and Helen Logan).
Alexandre Dumas (2016). “The Count Of Monte Cristo (Illustrated Edition of the Adventure Classic): Historical Thriller from the renowned French writer, known for The Three Musketeers, The Black Tulip, Twenty Years After, La Reine Margot and The Man in the Iron Mask”, p.1463, e-artnow (Open Publishing)