Agit Bagus Hartadi, Bagus Susetyo. The Management of Extracurricular Marching Band Instruction: A Case Study of the Gema Dirgantara Marching Band at SMP Negeri 3 Kroya. JURAGAN [Internet]. 2026 Jan. 25 [cited 2026 Oct. 15];3(1 (Spesial Issue):833-44. Available from: https://teewanjournal.com/index.php/juragan/article/view/2522