ARDANI, Madia Yuni; SUKMANINGTYAS, Wilis; SUSANTI, Indri Heri. Efek Natural Sound terhadap Tingkat Kecemasan pada Pasien Preoperasi: Systematic Literature Review. Jurnal Altifani Penelitian dan Pengabdian kepada Masyarakat, Indonesia, v. 6, n. 5, p. 2753–2761, 2026. DOI: 10.59395/altifani.v6i5.1375. Disponível em: https://mail.altifani.net/index.php/altifani/article/view/1375. Acesso em: 26 sep. 2026.