1. Rocca B (2019) Introduction to recommender systems—Towards data science. Medium, June 12. https://towardsdatascience.com/introduction-to-recommender-systems-6c66cf15ada
2. Bhatt B, Patel PJ, Gaudani H (2014) A review paper on machine learning based recommendation system. Int J Engineering Development Res (IJEDR) 2(4):3955–3961
3. Isinkaye F, Folajimi Y, Ojokoh B (2015) Recommendation systems: Principles, methods and evaluation. Egyptian Informatics J 16(3):261–273. https://doi.org/10.1016/j.eij.2015.06.005
4. What is a recommendation engine and how does it work. (2020). Express analytics, November 20 https://expressanalytics.com/blog/what-is-a-recommendation-engine-and-how-does-it-work/
5. Mall R (2019) Recommender system—Towards data science. Medium, January 10. https://towardsdatascience.com/recommender-system-a1e4595fc0f0