1. International Organization Standardization ISO 140-4: Acoustic – Part 4: Field measurements of airborne sound insulation between rooms. Geneva; 1998.
2. International Organization Standardization ISO 140-5: Acoustic Part 5: Field measurements of airborne sound of façade elements and façades. Geneva; 1998.
3. International Organization Standardization ISO 717-1: Acoustic – Rating of sound insulation in buildings and of building elements – Part 1: Airborne sound insulation. Geneva; 1996.
4. Schallschutz und Raumakustik in der Praxis;Fasold,2003
5. Noise reduction;Beraneck,1960