Najib, M, et al. “Photochemical Property of Ethyl Acetate of Salam Stem Cortex (Syzygium Polyanthum)”. Journal of Natural Sciences and Mathematics Research, vol. 3, no. 2, Dec. 2017, pp. 255-7, https://journal.walisongo.ac.id/index.php/JNSMR/article/view/10952.