1. AAPOR. (2021). Response rates – An overview. Retrieved from http://web.archive.org/web/20210822054624/https://www.aapor.org/Education-Resources/For-Researchers/Poll-Survey-FAQ/Response-Rates-An-Overview.aspx
2. Evaluation of disaster preparedness training and disaster drill for nursing students
3. AT&T. (2021). CMAS (Commercial Mobile Alert System). Retrieved from https://web.archive.org/web/20210930201840/https://www.att.com/device-support/article/wireless/KM1279564/BlackBerry/Torch4G9810
4. The use of community radio in managing natural disaster in Indonesia