1. New Opportunities for the Tourism Market: Senior Tourism and Accessible Tourism
2. Allergic Traveller. (n.d.). Retrieved March 28, 2017 from http://allergictravelerapp.com/
3. AllergyFT. (n.d.). Retrieved March 28, 2017 from http://allergyft.com/
4. AllergyEats. (n.d.). Retrieved April 1, 2017 from https://www.allergyeats.com
5. Bausch, A.-M. (2016). Tourism trends and ageing. Retrieved April 20, 2017, from http://ec.europa.eu/eurostat/statistics-explained/index.php?title=Statistics_on_ageing_and_tourism&oldid=319026