SIHOMBING, D. J. C. Optimizing Apartment Management through Extreme Programming-based CRM Application . Jurnal Info Sains : Informatika dan Sains, [S. l.], v. 13, n. 03, p. 744–753, 2023. Disponível em: https://ejournal.seaninstitute.or.id/index.php/InfoSains/article/view/3306. Acesso em: 17 aug. 2026.