Martins, Eunice Francisca Martins E. F., e Cármem Mayana Bonfim Esteves Oliveira C. M. B. E Oliveira. “Breast Feeding Initial Difficulties -Descriptive Study”. Online Brazilian Journal of Nursing, vol. 5, nº 1, abril de 2006, https://doi.org/10.17665/1676-4285.2006183.