Winston Churchill's addree as Home Secretary to Prime Minister Asquith on compulsory sterilization of 'the feeble-minded and insane', as quoted in "'Race', Sport and British Society" edited by Ben Carrington and Ian Mcdonald, 2001.
Thomas Stephen Szasz (1997). “The Manufacture of Madness: A Comparative Study of the Inquisition and the Mental Health Movement”, p.170, Syracuse University Press