George Bernard Shaw (2015). “George Bernard Shaw: The Collected Plays (Illustrated): 60 plays including Caesar and Cleopatra, Pygmalion, Saint Joan, The Apple Cart, Cymbeline, Androcles And The Lion, The Man Of Destiny, The Inca Of Perusalem and Macbeth Skit”, p.1383, e-artnow
"Elizabeth Banks Talks PITCH PERFECT 2 (and 3), WET HOT AMERICAN SUMMER and THE LEGO MOVIE Sequel". Interview with Steve Weintraub, collider.com. May 16, 2015.
Max Planck's address on the 25th anniversary of the Kaiser-Wilhelm Gesellschaft (January 1936) as quoted in Kristie Macrakis "Surviving the Swastika: Scientific Research in Nazi Germany", 1993.
Erasmus Darwin (1800). “Phytologia, or the philosophy of agriculture and gardening; with the theory of draining morasses and with an improved construction of the drill plough”, p.560