Reference
- Tatge , R. B. , ed. November 25 1959 . Letter reporting results of tests , November 25 , Schenectady, N, Y : GE General Engineering Laboratory . Bldg. 37, Room 602
- El-Mawardi , O. K. . Chap. 9 . Handbook of Noise Control. . New York : McGraw-Hill Book Co., Inc. .
- Beranek , L. L. 1954 . Acoustics. , New York : McGraw-Hill Book Co., Inc. .
- Fawcett , H. H. Revised November 1959 . Living in the Air We Breathe. , Revised November , Schenectady, N. Y : General Electric Research Laboratory . 53 pages, P.O. Box 1088