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Chin Kian Keong (2002-10-23). "Road pricing Singapore's experience"(PDF). Third Seminar of the IMPRINT-EUROPE Thematic Network: "Implementing Reform on Transport Pricing: Constraints and solutions: learning from best practice". Archived from the original(PDF) on June 27, 2008. Retrieved 2008-07-15.
Salter, Alan (2007-05-05). "C-charge details revealed". Manchester Evening News. M.E.N. Media Ltd. Archived from the original on 2008-07-08. Retrieved 2008-07-15.
"Costanera Norte Tarifas 2010"(PDF) (in Spanish). Sociedad Concesionaria Costanera Norte. Archived from the original(PDF) on February 15, 2010. Retrieved 2010-02-27. Three different tolls are charged based on pre-set average operating speeds: basic non-peak hour, basic rush hour, and fixed congestion toll.
AECC (September 2011). "Norway to allow Congestion Charging"(PDF). AECC Newsletter: International Regulatory Developments. Archived from the original(PDF) on 2015-11-17. Retrieved 2015-11-17. See pp. 7
Agarwal, Sumit; Koo, Kang Mo (2016-09-01). "Impact of electronic road pricing (ERP) changes on transport modal choice". Regional Science and Urban Economics. 60: 1–11. doi:10.1016/j.regsciurbeco.2016.05.003. ISSN0166-0462.
Agarwal, Sumit; Koo, Kang Mo; Sing, Tien Foo (2015-11-01). "Impact of electronic road pricing on real estate prices in Singapore". Journal of Urban Economics. 90: 50–59. doi:10.1016/j.jue.2015.09.004. ISSN0094-1190.