1. Appleton, A. B. andSimon, G. (1958)Surface and radiological anatomy. 4th edn. pp. 124–126, 173–174, W. Heffer, Cambridge.
2. Auenbrugger, L. (1761)Inventum novum ex percussione thoracis humani ut signo abstrusos interni pectoris morbos detegendi. Reprinted 1966, Dawsons, London (translated by Forbes, 1824).
3. Cabot, R. C. (1906)Physical diagnosis. 3rd edn. Bailliere, Tindall & Cox, London.
4. Casteleijn, G. (1961)Physical investigations on percussion. Bronder-Offset, Rotterdam.
5. Castex, E. (1895) Du son percussion du thorax.Arch. Physiol. Norm. Path. 7, 18–26.