1. Albuquerque H., Costa C., Martins F., 2018. The use of geographical information systems for tourism marketing purposes in Aveiro region (Portugal). Tourism Management Perspectives 26: 172-178.
2. Alén E., Domínguez T., Losada N., 2012. New opportunities for the tourism market: Senior tourism and accessible tourism. In: Kasimoglu M. (ed.), Visions for global tourism industry: Creating and sustaining competitive strategies. InTech, London 139-166.
3. Bartoszewski A., 2010. The latest achievements of information technology and tourism – New challenges and opportunities. In: Denek K. (ed.), Education of tomorrow, The process of upbringing in and out of school. Humanitas Publishing House, Bucharest: 20-35.
4. Bielecka E., 2006. Geographic information systems – Theory and applications. PJWSTK, Warszawa.
5. Biłozor A., Kowalczyk A.M., Bajerowski T., 2018. Theory of scale-free networks as a new tool in researching the structure and optimization of spatial planning. Journal of Urban Planning and Development 144(2).