1. R. Pressl and T. Rye, “Good reasons and principles for Parking Management”, CIVITAS. Project Park4SUMP, p. 38 (2020), https://park4sump.eu/news-events/news/good-reasons-and-principles-parking-management
2. A. Oktav, “New Trends and Recent Developments in Automotive Engineering”, Chapter: 331, in Researches on Science and Art in 21st Century Turkey, edited by H. Arapgirlioğlu, R. L. Elliott, E. Turgeon and A. Atik (Gece Kitaplhgh, 2017), pp. 2976–2987.
3. Ordinance № RD-02-20-2 of 20 December 2017 on planning and design of the communication and transport system of urban areas (promulgated SG, issue 7 of 2018; amended, issue 15 of 2018, amended and supplemented, issue 98 of 2018), (In Bulgarian).
4. Influence of Parking Price on Parking Garage Users’ Behaviour
5. M. Kodransky and G. Hermann, Europe’s Parking U-Turn: From Accommodation to Regulation (ITDP, New York, USA, 2011), p. 84.