IRWANTO, Irwanto et al. METODOLOGI PENELITIAN KUALITATIF: Pendekatan Konseptual dan Operasional. [s.l.] : Widina Media Utama,2026. Disponível em: https://omp.penerbitwidina.com/index.php/widina/catalog/book/1. Acesso em: 6 nov. 2026.