The Process of Etching: artmondo.net/printworks/articles/process.htm
The B F Skinner Foundation: http://www.bfskinner.org/
The Process of Aquatinting: en.wikipedia.org/wiki/Aquatint
Guardian Article: I was not a Lab Rat’, Deborah’s response to Lauren Slater’s book, ‘Opening Skinner’s Box’ and to the reviews of it: www.guardian.co.uk/education/2004/mar/12/highereducation.uk