References
- Gimson A. C. An Introduction to the Pronunciation of English. Arnold, London 1974
- Prds Project Working Party. The Phonetic Representation of Disordered Speech. The King's Fund, London 1983
- Vieregge W. H. Transcriptie van Spraak: Theoretische en Praktische Aspecten van de Symboolfonetiek. Foris, Dordrecht 1985