Marshall Cavendish Illustrated Encyclopedia of World War I. Vol. Vol. four. New York: Routledge. New York: Marshall Cavendish. Burnaby: Simon Fraser University. Waterloo: Wilfrid Laurier University Press. Princeton, New Jersey: Princeton University Press. Washington DC: National Academies Press. In 2001, the University of Pennsylvania School of Social Work unveiled a examine on CSEC executed in 17 cities across the United States.