Queiróz, D.A.O., et al. “ Risk Factors and Prevalence of Antibodies Against Hepatitis A Virus (HAV) in Children from Day-Care Centers, in Goiania, Brazil ”. Revista Do Instituto De Medicina Tropical De São Paulo, vol. 37, no. 5, Oct. 1995, pp. 427-33, https://revistas.usp.br/rimtsp/article/view/29303.