“Kandungan Logam Berat Timah Hitam (Pb) Dalam Urine Siswa Sekolah Dasar”. Journal of Telenursing (JOTING) 4, no. 2 (October 20, 2022): 575–581. Accessed September 21, 2025. https://journal.ipm2kpe.or.id/index.php/JOTING/article/view/3907.