Van Anh, N., Thanh Hoa, T., Anh, T., Tuan, L., Bang, K., Bach, N. and Chau, N. 2026. Green Tourism Market in Hanoi City: Opportunities and Challenges. GPH-International Journal of Business Management. 9, 04 (May 2026), 97-108. DOI:https://doi.org/10.5281/zenodo.20456093.