M. Ratu, Jacob, N. Adiputra, IPG Adiatmika, and Ketut Tirtayasa. “Quality of Working Life of Palm Tappers in Eastern Indonesia”. International Journal of Sciences: Basic and Applied Research (IJSBAR) 26, no. 2 (April 12, 2016): 57–66. Accessed September 14, 2025. https://gssrr.org/JournalOfBasicAndApplied/article/view/5485.