2015BS EN ISO 1683:2015 Acoustics. Preferred reference values for acoustical and vibratory levels
2009BS EN ISO 1683:2008 Acoustics - Preferred reference values for acoustical and vibratory levels
1994BS EN 21683:1994 Acoustics. Preferred reference quantities for acoustic levels
BS EN ISO 1683:2009 Acoustics. Preferred reference values for acoustical and vibratory levels has been changed from BS EN 21683:1994 Acoustics. Preferred reference quantities for acoustic levels.