1. Al-Bataineh, K. B., Banikalef, A., Abdullah, A. E., & Albashtawi, A. H. (2019). The Effect of Blended Learning on EFL Students’ Grammar Performance and Attitude: An Investigation of Moodle. Arab World English Journal (AWEJ) Volume, 10. http://doi.org/10.24093/awej/vol10nol.27
2. Azhar, K. A., & Iqbal, N. (2018). Effectiveness of Google Classroom : Teachers’ Perceptions EFFECTIVENESS OF GOOGLE CLASSROOM : TEACHERS’. PRIZEN SOCIAL SCIENCE JOURNAL, 2(2), 1-16
3. Basuki, Sulistyo. 2006. Metode Penelitian. Jakarta: Wedatama Widya Sastra dan Fakultas Ilmu Pengetahuan Budaya Universitas Indonesia
4. Brannen, Julia. MemaduMetode Penelitian Kualitatif& Kuantitatif. Yogyakarta: Pustaka Pelajar, 1997
5. Hakim, A. B. (2016). Efektifitas Penggunaan E-Learning Moodle, Google Classroom dan Edmodo. I-STATEMENT,2(1).1-6