1. Acoustical Performance Criteria, Design Requirements and Guidelines for Schools. ANSI 12.60-2002.,2002
2. Position Statement and Guidelines for Acoustics in Educational Settings.;ASHA,1995
3. Acoustics-Recommended Design Sound Levels and Reverberation Times for Building Interiors. AS/NZS 2107: Sydney and Wellington:,2000
4. Speech intelligibility studies in classrooms.;Bradley;J Acoust Soc Am,1986
5. The intelligibility of speech in elementary school classrooms.;Bradley;J Acoust Soc Am,2008