http://www.mfbfreaks.nl/pdf/div/philips_luidsprekerbehuizingen_voor_zelfbouw_web_20081016.pdf

http://www.robkalmeijer.nl/techniek/electronica/electronicabladen/Philips_hobbyskoop/index.html

http://www.radiodatabase.nl/

http://www.eliveld.nl/themes/philipsaudio/philipsaudio.html

http://www.eliveld.nl/themes/hobbyskoop/hobbyskoop.html

http://www.eliveld.nl/articles/2014/2105/2105.html

http://www.eliveld.nl/themes/overigephilips/overigephilips.html#Luidsprekerbehuizingen-voor-zelfbouw-1971

https://forum.xojo.com/30275-sound-generator/0

https://developer.apple.com/documentation/avfoundation/audio_track_engineering

https://www.blackcatsystems.com/software/audio-function-generator-software.html

www.nch.com.au/tonegen/index.html

https://nl.wikipedia.org/wiki/Resolutie_(geluidsmeting)#Tertsbanden_of_1/3_octaafbanden

https://www.engineeringtoolbox.com/octave-bands-frequency-limits-d_1602.html