Hamidiyanti, Baiq Yuni Fitri, et al. “Effectiveness Of The ‘Nganak Kodek’ Android App In Enhancing Knowledge Of Birth Preparedness, Breastfeeding Technique, And Exclusive Breastfeeding Among Adolescent Primigravidas”. Jurnal Kesehatan Manarang, vol. 11, no. 3, Dec. 2025, pp. 411-7, doi:10.33490/jkm.v11i3.2005.