Tay Lik Wui, Edgar; Yip, James W. L.; Li, Wei (2011-01-01), Gatzoulis, Michael A.; Webb, Gary D.; Daubeney, Piers E. F. (eds.), "5 - Echocardiography", Diagnosis and Management of Adult Congenital Heart Disease (Second Edition), Saint Louis: Churchill Livingstone, pp. 28–43, doi:10.1016/b978-0-7020-3426-8.00005-8, ISBN978-0-7020-3426-8, retrieved 2020-11-25
Tay Lik Wui, Edgar; Yip, James W. L.; Li, Wei (2011-01-01), Gatzoulis, Michael A.; Webb, Gary D.; Daubeney, Piers E. F. (eds.), "5 - Echocardiography", Diagnosis and Management of Adult Congenital Heart Disease (Second Edition), Saint Louis: Churchill Livingstone, pp. 28–43, doi:10.1016/b978-0-7020-3426-8.00005-8, ISBN978-0-7020-3426-8, retrieved 2020-11-25