Purba, Jhon Hardy, et al. “Growth and Yield Response of Shallot (Allium Ascalonicum L. Var. Tuktuk) from Different Source Materials Applied With Liquid Biofertilizers”. Nusantara Bioscience, vol. 12, no. 2, Sept. 2020, https://doi.org/10.13057/nusbiosci/n120207.