Doctor, T. R., Manuel, J. J. F., Rivera, M. P., Kebasen, C. A., & Bulayungan, F. L. (2010). Water Quality of the Main Water Source of Village Ambassador, Tublay, Benguet using the Allium cepa Test. JPAIR Multidisciplinary Research, 5(1), 97-111. https://doi.org/10.7719/jpair.v5i1.126