WANJA, T.; NJOROGE, K.; OSORO, E. N. Factors influencing upward referral system of patients in Nairobi County. International Journal Of Community Medicine And Public Health, [S. l.], v. 8, n. 10, p. 4759–4766, 2021. DOI: 10.18203/2394-6040.ijcmph20213646. Disponível em: https://www.ijcmph.com/index.php/ijcmph/article/view/8668. Acesso em: 11 oct. 2025.