1. I. M. Goldsmith, "A Study to Define the Research and Technology RequirementsforAdvanced TurboproplPropfan Transport Aircraft," NASA Contract NAS2-10118, Douglas Report ACEE-16-FR-0116,May 1980.
2. Theory and interpretation of experiments on the transmission of sound through partition walls
3. ANSIIASTM E336-77, "Standard Test Method for Measurement of Airborne Sound Insulation in Buildings." pp854-856,August 1977.