PURWIYANTO. Developing Special Product Development Models. International Journal Of Humanities Education and Social Sciences (IJHESS) , [S. l.], v. 2, n. 4, 2023. DOI: 10.55227/ijhess.v2i4.365. Disponível em: http://ijhess.com/index.php/ijhess/article/view/365. Acesso em: 24 jun. 2026.