1. Allard, T., & Lamb, K. (2020). Endless first wave: How Indonesia failed to control coronavirus, Reuters. Retrieved from: https://www.reuters.com/article/us-health-coronavirus-indonesia-insight/endless-first-wave-how-indonesia-failed-to-control-coronavirus-idUSKCN25G02J
2. Asip, H. (2020). Pray from home, together: NU holds massive online religious gathering in East Java.” Jakarta Post. Retrieved from: https://www.thejakartapost.com/news/2020/04/09/pray-from-home-together-nu-holds-massive-online-religious-gathering-in-east-java.html
3. Ayalon, Y. (2014). Natural disasters in the Ottoman Empire: Plague, famine and other misfortunes. Cambridge University Press.
4. Badshah, A. (2020). Spread of coronavirus disease-19 among devotees during religious congregations. Annals of Thoracic Medicine, 15(3), 105–106.
5. Baidowi, A., Salehudin, A., Mustaqim, A., Qudsy, S., & Hak, N. (2021). Theology of health of Quranic pesantren in the time of COVID-19, HTS Teologiese Studies/Theological Studies 77, 4. Retrieved from: http://www.scielo.org.za/pdf/hts/v77n4/65.pdf