Belawati, Tian, and Amin Zuhairi. “The Practice of a Quality Assurance System in Open and Distance Learning: A Case Study at Universitas Terbuka Indonesia (The Indonesia Open University)”. The International Review of Research in Open and Distributed Learning 8, no. 1 (March 16, 2007). Accessed July 13, 2024. https://www.irrodl.org/index.php/irrodl/article/view/340.