Референци

• European Parliament. (2020). Fact sheets on the European Union: Tourism. Retrieved from https://www.europarl.europa.eu/factsheets/fr/sheet/126/tourism
• European Parliament. (2017). Research for TRAN Committee – European Tourism Labelling. Retrieved from https://www.europarl.europa.eu/RegData/etudes/STUD/2018/617461/IPOL_STU(2018)617461_EN.pdf .
• European Parliamentary Research Service. (2017). Sustainable tourism: The environmental dimension. Retrieved from https://www.europarl.europa.eu/RegData/etudes/BRIE/2017/599327/EPRS_BRI(2017)599327_EN.pdf
• Plüss, C., Zotz, A., Monshausen, A., & Kühhas, C. (2012). Sustainability in tourism. A guide through the label jungle. Naturefriends International: Vienna, Austria.
• European Commission. (2021). European Tourism Indicators System for sustainable destination management. Retrieved from https://ec.europa.eu/growth/sectors/tourism/offer/sustainable/indicators_en
• EPA. (2021). Learn About Environmental Management Systems. Retrieved from https://www.epa.gov/ems/learn-about-environmental-management-systems

Ecolabel

• European Commission. (2015). EU Ecolabel News Alert – Special Edition. Retrieved from https://ec.europa.eu/environment/ecolabel/documents/news_alert/2_semester_2015.pdf
  European Resource Efficiency Knowledge Centre. (2017). Hotel guests view EU Ecolabel as proof of quality. Retrieved from https://www.resourceefficient.eu/nl/node/814

EMAS

• European Commission. (2007). EMAS “easy” for small and medium enterprises. Retrieved from https://op.europa.eu/en/publication-detail/-/publication/a46da1ae-edee-47aa-b871-d13baa946379
• European Commission. (2021). EMAS: How does it work? Retrieved from https://ec.europa.eu/environment/emas/join_emas/how_does_it_work_step0_en.htm
  European Commission. (2021). EMAS: What is EMAS? Retrieved from https://ec.europa.eu/environment/emas/index_en.htm

Green Key

• Green Key. (2016). From a Basement to the World – The story of Green Key. Retrieved from https://static1.squarespace.com/static/55371f97e4b0fce8c1ee4c69/t/574301bff699bb27dcd47974/1464009153745/GreenKeyHistory-documentfromHORESTA.pdf
• Green Key. (2021). Application process. Retrieved from https://www.greenkey.global/application-process  

Ecocamping

• Ecocamping (2021). Ecocamping principles. Retrieved from https://ecocamping.de/this-is-ecocamping/ecocampingprinciples

TourCert

• TourCert. (2021). Why TourCert? Retrieved from https://www.tourcert.org/en/why-tourcert/

Travelife

• Travelife. (2021). Tour operators and Travel agents. Retrieved from https://www.travelife.info/index_new.php?menu=home&lang=en
• Travelife. (2021). Welcome to Travelife. Retrieved from https://www.travelife.org/Hotels/landing_page.asp