PANIMALAR.S, JERRIN SIMLA, DEEPA.J, VISHALI .S, and SUMITHRA .T.S. “HOTEL ENDORESMENT SYSTEM BASED ON COLLABRATIVE FILTERING AND KNN ALGORITHM”. International Journal of Advance Research in Engineering, Science & Technology, vol. 5, no. 3, Mar. 2018, pp. 61-66, https://ijarest.org/index.php/ijarest/article/view/1171.