1. Jentzsch, A.: Tourism Standards. XML Clearinghouse, http://www.xmlclearinghouse.de/reports/Tourism%20Standards.pdf
2. Millard, J.: The nature of e-tourism services, Prisma Strategic (2003), http://www.prisma-eu.net
3. Kim, C.: E-tourism: An Innovative Approach for the Small and Medium-sized Tourism Enterprises (SMITEs) in Korea (2000), http://www.oecd.org/dataoecd/56/13/34268048.pdf
4. Cardoso, J.: E-tourism: Creating Dynamic Packages using Semantic Web Processes (2005), http://www.w3.org/2005/04/FSWS/Submissions/16/paper.html
5. Vongdoiwang, W., Batanov, D.N.: Similarities and Differences between Ontologies and Object Model. In: CCCT 2005 Conference Proceeding (2005)