Tobing, J. H., Ricky, D. R. and Sari, D. N. (2016) “THE ANTIOXIDANT ACTIVITY OF THE EXTRACT OF AFRICAN LEAVES (VERNONIA AMYGDALINA) USING 1,1-DIPHENYL-2- PICRYLHYDRAZYL (DPPH) METHOD”, Abstract Proceedings International Scholars Conference, 4(1), p. 74. doi: 10.35974/isc.v4i1.1845.