Javed, U., K. Shaukat, I. A. Hameed, F. Iqbal, T. Mahboob Alam, and S. Luo. “A Review of Content-Based and Context-Based Recommendation Systems”. International Journal of Emerging Technologies in Learning (iJET), vol. 16, no. 03, Feb. 2021, pp. pp. 274-306, doi:10.3991/ijet.v16i03.18851.