1. The theory of planned behavior
2. Barkel, C., & Veuger, J. (2020). A Blockchain Business Model for Decentralized Networks. J. Veuger (Ed.), Blockchain Technology and Applications II, 73-100. Hauppage, USA: Nova Science Publishers Inc.
3. Barkel, C., Kurgum, H., & Groen, B. (2021). Blockchain in the Hospitality and Tourism Industry. Hospitality & Tourism Information Technology. University of Florida. https://www.doi.org/10.5038/9781732127593
4. Firm Resources and Sustained Competitive Advantage
5. Barthel, J., & Perret, S. (2015). OTAs - a hotels friend or foe?