References
- Borland O., Courtois J. Open mould/no mould fittings. Paper given at Oticongress, 1971, 1971
- Cooper W. A., Franks J. R., McFall R. N., Goldstein D. P. Variable venting valve forearmoulds. Audiology 1975; 14: 259–267
- Delk J. The Hearing Aid Dealer. Ch. 10 in. Interpreting Hearing Aid Technology, Donnelly Kenneth. Publ. Charles Thomas. 1974
- Lybarger S. F. Earmould Acoustics. Audecibel 1967; 16(i)9
- Weatherton M. A., Goetzinger C. P. The effects of various modified earmoulds on hearing sensitivity. J. Audit. Res. 1971; 11(i)25–32