TAYONE, Janeth C. Biological and Chemical Characteristics of Groundwater in a Rural Settlement Area of Davao Oriental. American Scientific Research Journal for Engineering, Technology, and Sciences, Jordan, v. 14, n. 1, p. 94–99, 2015. Disponível em: https://www.asrjetsjournal.org/American_Scientific_Journal/article/view/829. Acesso em: 15 oct. 2025.