KAUTSAR, Denise; ALI, Mohamad. Budaya Sekolah Unggul SMP Birrul Walidain Muhammadiyah Sragen. Prosiding University Research Colloquium, [S. l.], p. 39–46, 2019. Disponível em: https://repository.urecol.org/index.php/proceeding/article/view/638. Acesso em: 4 may. 2024.