Gruyal, G. (2015), 'Selected Ethnomedicinal Plants of Northern Surigao Del Sur: Their Antioxidant Activities in Terms of Total Phenolics, ABTS Radical Cation Decolorization Power, and Ferric Reducing Ability', World Academy of Science, Engineering and Technology, Open Science Index 105, International Journal of Bioengineering and Life Sciences, 9(9), 981 - 984.