B. Arifin, S. Y. Saputra, A. Muzakki, E. Setiawan, and H. Jumareng, “Increase Students’ Self-Confidence and Reduce Anxiety During Covid-19: Is Coping Strategy Becomes the Solution?”, J. Obs. J. Pendidik. Anak Usia Dini, vol. 6, no. 5, pp. 4171–4180, Apr. 2022.