Nasrullah, Ihzra Firman, et al. “Training on Compost Production and Vertical Gardening in the Zero Waste School Program at SDN Meat, Toba Regency”. Altifani Journal: International Journal of Community Engagement, vol. 6, no. 1, Apr. 2026, pp. 48-57, doi:10.32502/altifani.v6i1.1825.