Abu-Haifa, Mohammad, Bara’a Etawi, Huthaifa Alkhatatbeh, and Ayman Ababneh. 2024. “Comparative Analysis of ChatGPT, GPT-4, and Microsoft Copilot Chatbots for GRE Test”. International Journal of Learning, Teaching and Educational Research 23 (6):327-47. https://www.ijlter.net/index.php/ijlter/article/view/1974.