Purba, Hermawan, Helen Anjelina Simanjuntak, and Risanti Situmorang. 2020. “Phytochemical Screening of Bunga Rosella (Hibiscus Sabdariffa L) and Antimicrobial Activity Test”. Jurnal Pendidikan Kimia 12 (2):70-78. https://doi.org/10.24114/jpkim.v12i2.19398.