Azizpour, F., and F. Fathizadeh. “Barriers to Collaboration Among Tourism Industry Stakeholders. Case Study: Mashhad Metropolis”. Almatourism - Journal of Tourism, Culture and Territorial Development, vol. 7, no. 13, Jan. 2016, pp. 48-65, doi:10.6092/issn.2036-5195/5991.