SIHOMBING, D. J. C. Elementary School Communication Transformation: Developing a Parent-Teacher Communication and Information System with the Spiral Method. Jurnal Info Sains : Informatika dan Sains, [S. l.], v. 13, n. 03, p. 777–784, 2023. Disponível em: https://ejournal.seaninstitute.or.id/index.php/InfoSains/article/view/3385. Acesso em: 21 apr. 2026.