1. Ronsse LM, Wang LM Classroom acoustics affect student achievement. http://www.csemag.com/home/single-article/classroom-acoustics-affect-student-achievement/0e5cd30611.html
2. Study shows background noise affects test scores. PHYSorg.Com.2 Nov 2011. http://medicalxpress.com/news/2011-11-background-noise-affects-scores.html
3. GB 50118-2010 Code for design of sound insulation of civil buildings
4. http://www.fefpa.org/pdf/summer2007/ClassroomAcoustics.pdf
5. Classroom Acoustics Standard TimeLine: http://www.asha.org/uploadedFiles/ASHA/Publications/leader/2010/100921/Classroom-Acoustics-Timeline.pdf