Odeh, Salaheddin, and Eiman Ketaneh. “Collaborative Working E-Learning Environments Supported by Rule-Based E-Tutor”. International Journal of Online and Biomedical Engineering (iJOE) 3, no. 4 (November 13, 2007). Accessed May 4, 2024. https://online-journals.org/index.php/i-joe/article/view/452.