Tan, Min, and Maoguo Wu. “Course Recommendation Mechanism Based on Content Recommendation Method – Illustrated by the Example of ‘NetEase Cloud Classroom’”. European Scientific Journal, ESJ 14, no. 19 (July 31, 2018): 167. Accessed July 5, 2022. https://eujournal.org/index.php/esj/article/view/11077.