Nudes, Prudes and Attitudes: Pornography and Censorship. Gloucester: New Clarion Press. 1994: 69. https://web.archive.org/web/20131125083809/http://www
Kids at work : Lewis Hine and the crusade against child labour. New York: Clarion Books. 1994: 54–57. ISBN 0395587034. Child Labour by Professor David Cody