Khomsan, Ali, et al. “An Overview of Integrated Health-Nutrition Service and Characteristics of Volunteer Health Workers: A Study in West Java, Indonesia”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 59, no. 1, June 2021, pp. 16-26, https://www.gssrr.org/JournalOfBasicAndApplied/article/view/12698.