1. Annoyance in working environments due to low frequency noise with or without tones;kerlund,1990
2. American national standard methods for the calculation of the articulation index;American National Standards Institute,1969
3. Traffic noise annoyance and noise sensitivity in persons with normal and impaired hearing;Aniansson;Journal of Sound and Vibration,1983
4. Standard recommended procedure for laboratory measurement of airborne sound transmission loss;ASTM,1975