Reference
- Fletcher , H. 1953 . Speech- and Hearing in C ommunication. , 86 New York : D. Van Nostrand Company, Inc. .
- Mayer , A. A. 1876 . Philosophy Magazine , 11 : 500
- 157 Ob. Cit., H. Fletcher
- Parkinson , J. S. 1955 . Control of Interior Noise. . Noise Control , 1 Jan. : 54
- Beranek , L. L. 1957 . Revised Criteria for Noise in Buildings. . Noise Control , 3 Jan. : 19
- Knudsen , V. O. and Harris , C. M. 1955 . Acoustical Designing in Architecture. , 153 New York : John Wiley & Sons, Inc. .
- Ibid. , 170
- Ibid. , 68
- Ibid. , 354
- Jan. 1960 . “ Acoustical Materials Association ” . In Sound Absorption Coefficients of Architectural Acoustical Materials, Bulletin XX. , Jan. , New York, New York : Acoustical Materials Association .
- Ibid. ,
- 43 Ob. Cit., Knudsen and Harris
- August 4 1954 . Federal Specification, Acoustical Units; Prefabricated, No. SS-A-118B , August 4 , U. S. Government Printing Office .
- Ob. Cit. , Acoustical Materials Association .
- Jan. 1960 . Building Materials List. , Jan. , Chicago : Underwriters Laboratories, Inc. .
- Ob. Cit. , Acoustical Materials Association .
- Ob. Cit. , U. S. Government Printing Office .
- Ob. Cit. , Acoustical Materials Association .