Madiyono, Bambang, Jumiety Achmad, Sudigdo Sastroasmoro, Ismet N. Oesman, and Sukman T. Putra. 1996. “Clinical Features and Management of Secundum Atrial Septal Defect in Infants and Children”. Medical Journal of Indonesia 5 (1):42-8. https://doi.org/10.13181/mji.v5i1.844.