Abdelrahman Sheta, “Visitor Sentiment and Behavioral Analytics: Leveraging NLP to Continuously Improve Hajj and Umrah Services”, Int. J. Sci. Res. Comput. Sci. Eng. Inf. Technol, vol. 11, no. 5, pp. 379–389, Oct. 2025, doi: 10.32628/CSEIT251117139.