KUWAWENARUWA, A.; MACHA, J.; BORGHI, J. Willingness to pay for voluntary health insurance in Tanzania. East African Medical Journal, [S. l.], v. 88, n. 2, p. 54–64, 2012. DOI: 10.4314/eamj.v88i2. Disponível em: https://www.ajol.info/index.php/eamj/article/view/82600. Acesso em: 22 aug. 2026.