Agit Bagus Hartadi and Bagus Susetyo, “The Management of Extracurricular Marching Band Instruction: A Case Study of the Gema Dirgantara Marching Band at SMP Negeri 3 Kroya”, JURAGAN, vol. 3, no. 1 (Spesial Issue), pp. 833–844, Jan. 2026, doi: 10.62710/5e8phq87.