Mitcham, C., and A. Briggle,
"The Interaction of Ethics and Technology in Historical Perspective",
Handbook of the Philosophy of Science: Philosophy of Technology and Engineering Sciences, vol. 9, Amsterdam, Elsevier, pp. 1147-1191, 2009.
Barley, S. R., and G. Kunda,
"Itinerant Professionals: Technical Contractors in a Knowledge Economy",
America at Work: Choices and Challenges, New York, Palgrave Macmillan, pp. 173-193, 2006.