“Self Efficacy Siswa Yang Mengikuti Ekstrakurikuler Bola Voli Di Smk Negeri 1 Kota Bengkulu: Self Efficacy of Students Participating in Extracurricular Activities volley ball at SMK Negeri 1 Bengkulu City”, SG, vol. 4, no. 2, pp. 289–298, Oct. 2023.