1. Motchenbacher C.D., Connelly J.A. “Low-noise electronic system design”. (1993).
2. Morozan, Cristian; Enache, Elena; Purice, Suzana. "Visual Pollution: A New Axiological Dimension Of Marketing?" University of Pite, Faculty of Management-Marketing in Economic Affairs Brilla. Archived from the original on October 8, 2019. Retrieved March 29, 2013.
3. Measuring visual pollution by outdoor advertisements in an urban street using intervisibilty analysis and public surveys
4. Morozan, Cristian; Enache, Elena; Purice, Suzan. "Visual Pollution: A New Axiological Dimension of Marketing?" 2013.
5. "Noise: Policy Context". European Environmental Agency. June 3, 2016. Archived from the original on August 12, 2016. Retrieved June 16, 2016