1. Arras, F., Massacci, G., & Pittaluga, P. (2003). Soundscape Perception in Cagliari, Italy. Euronoise, Naples. http://www.inquinamentoacustico.it/_dowload/la_percezione_dei_paesaggi_sonori_di_cagliari%20-%20arras.PDF.
2. Audio-Technica. (2019). QuietPoint 50 Noise-cancelling Headphones. Audio-Technica. https://www.audio-technica.com/cms/headphones/dbeb1a3799928bfd/index.html.
3. A principal components model of soundscape perception;Axelsson;The Journal of the Acoustical Society of America,2010
4. Biosphere Soundscapes;Barclay;Leonardo,2014
5. Soundwalking;Behrendt,2018