Langlois, P., & Hansen, S. J. (2012). World ESCO outlook. The Fairmont Press, Inc. : Taylor & Francis Ltd..

Langlois, Pierre, and Shirley J. Hansen. World ESCO Outlook. Lilburn, Georgia ; Boca Raton, Florida ; London, England: The Fairmont Press, Inc. : Taylor & Francis Ltd., 2012.

Langlois, Pierre, and Shirley J. Hansen. World ESCO Outlook. The Fairmont Press, Inc. : Taylor & Francis Ltd., 2012.