CHOIRUNNISA, LUTFIA FAJAR, et al. “The Addition of Vermicompost and Biostarter Affects the Growth, Total Phenolic and Antioxidant Activity of Echinacea Purpurea”. Nusantara Bioscience, vol. 14, no. 2, July 2022, https://doi.org/10.13057/nusbiosci/n140203.