1. De Felice, F and Petrillo, A. 2009. Development of a model for the improvement of safety in the work place through the Analityc Network Process.Proceedings of the international symposium on the analytic hierarchy process (ISAHP). 2009, Pittsburgh, USA. Pittsburgh: University of Pittsburgh. 1–14
2. Jacobsson, A and Giversen, J. 2007.Eurogeographics[online]. Available from:http://www.eurogeographics.org/documents/Guidelines_ISO19100_Quality.pdf[Accessed 20 April 2011]