E. Panjaitan, C. J. Manalu, L. Sidauruk, and E. Sianipar, “Effect of Chicken Manure, Husk Charcoal on Growth, Production, P Availability of Shallot in Rice Fields”, Jurnal Multidisiplin Indonesia, vol. 2, no. 2, pp. 1235–1241, Dec. 2023.