Devansh Shah, Shikhar, Deepanshu Gupta, Vaibhav Pandilwar, Sanket Deshmukh, Dipen Saini. “Recommendation System Used in Tourism and Travel: A Review”. Design Engineering, no. 1, Feb. 2022, pp. 1781-8, http://www.thedesignengineering.com/index.php/DE/article/view/9134.