Value Proposition Testing Using Indirect Customer Observation Method for Personafic. European Journal of Business and Management Research, [S. l.], v. 6, n. 4, p. 84–87, 2021. DOI: 10.24018/ejbmr.2021.6.4.931. Disponível em: https://www.ejbmr.org/index.php/ejbmr/article/view/931. Acesso em: 4 nov. 2025.