Ma, Zhiqiang, Jing Wang, Qiyun Wang, Lili Kong, Yajie Wu, and Hao Yang. “Verifying Causal Relationships Among the Presences of the Community of Inquiry Framework in the Chinese Context”. The International Review of Research in Open and Distributed Learning 18, no. 6 (September 25, 2017). Accessed June 27, 2022. https://www.irrodl.org/index.php/irrodl/article/view/3197.