1. 5
of the best DACs. http://www.stuff.tv/music/5-best-dacshow-make-your-digital-music-sound-amazing/feature. Accessed 05/15/2014. 5 of the best DACs. http://www.stuff.tv/music/5-best-dacshow-make-your-digital-music-sound-amazing/feature. Accessed 05/15/2014.
2. Ambient Sound Effects. http://www.pacdv.com/sounds/ambience_sounds.html. Accessed 05/15/2014. Ambient Sound Effects. http://www.pacdv.com/sounds/ambience_sounds.html. Accessed 05/15/2014.
3. Audacity is free open source cross-platform software for recording and editing sounds. http://audacity.sourceforge.net/. Accessed 05/15/2014. Audacity is free open source cross-platform software for recording and editing sounds. http://audacity.sourceforge.net/. Accessed 05/15/2014.
4. Audio 4 Smartphones -- Wolfson Microelectronics. http://www.wolfsonmicro.com/documents/uploads/misc/en/Audio4Smartphones.pdf. Accessed 05/15/2014. Audio 4 Smartphones -- Wolfson Microelectronics. http://www.wolfsonmicro.com/documents/uploads/misc/en/Audio4Smartphones.pdf. Accessed 05/15/2014.
5. Global mobile statistics 2013. http://mobithinking.com/mobile-marketing-tools/latestmobile-stats/a. Accessed 05/15/2014. Global mobile statistics 2013. http://mobithinking.com/mobile-marketing-tools/latestmobile-stats/a. Accessed 05/15/2014.