1. Font, X., Sanabria, R., & Skinner, E. (2003). Sustainable tourism and ecotourism certification: Raising standards and benefits. Journal of Ecotourism, 2(3), 213–218. https://doi.org/10.1080/14724040308668145
2. Pomfret, R., Review, K. A.-A. S., & 2001, undefined. (n.d.). Economic development strategies in Central Asia since 1991. Wiley Online Library. Retrieved from http://onlinelibrary.wiley.com/doi/10.1111/1467-8403.00100/full
3. Put-van den Beemt, W., & Smith, R. (2016). Smart tourism tools: linking technology to the touristic resources of a city. Smart Tourism Congress Barcelona, 1–12. Retrieved from https://www.cett.es/fitxers/campushtml/MiniWebs/122/papers/PUT_SMITH.pdf
4. Asia, J. B.-C. M. S. R. I. and S., & 2018, undefined. (n.d.). China’s Twenty-First Century Maritime Silk Road Initiative and South Asia: Political and Economic Contours, Challenges, and Conundrums. Springer. Retrieved from https://link.springer.com/chapter/10.1007/978-981-10-5239-2_1
5. Bendini, R. (2013). Uzbekistan: Selected trade and economic issues. Directorate-General For External Policies. Retrieved from http://www.europarl.europa.eu/RegData/etudes/briefing_note/join/2013/491518/EXPO-INTA_SP(2013)491518_EN.pdf