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Simeonova, Emilia; Currie, Janet; Nilsson, Peter; Walker, Reed (March 2018). «Congestion Pricing, Air Pollution and Children's Health». NBER Working Paper No. 24410. doi:10.3386/w24410.
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Agarwal, Sumit; Koo, Kang Mo (1 de septiembre de 2016). «Impact of electronic road pricing (ERP) changes on transport modal choice». Regional Science and Urban Economics60: 1-11. ISSN0166-0462. doi:10.1016/j.regsciurbeco.2016.05.003.
Agarwal, Sumit; Koo, Kang Mo; Sing, Tien Foo (1 de noviembre de 2015). «Impact of electronic road pricing on real estate prices in Singapore». Journal of Urban Economics90: 50-59. ISSN0094-1190. doi:10.1016/j.jue.2015.09.004.
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«The great crawl». 18 de junio de 2016. Consultado el 22 de junio de 2016. From the print edition.
Agarwal, Sumit; Koo, Kang Mo (1 de septiembre de 2016). «Impact of electronic road pricing (ERP) changes on transport modal choice». Regional Science and Urban Economics60: 1-11. ISSN0166-0462. doi:10.1016/j.regsciurbeco.2016.05.003.
Agarwal, Sumit; Koo, Kang Mo; Sing, Tien Foo (1 de noviembre de 2015). «Impact of electronic road pricing on real estate prices in Singapore». Journal of Urban Economics90: 50-59. ISSN0094-1190. doi:10.1016/j.jue.2015.09.004.
Bob McQueen; Tom Biggstitle; Chris Bausher (2006). «Congestion pricing»(iPaper). ETC, Etc (Thinking Highways) I (1): 35-36. Consultado el 23 de febrero de 2009.A PDF version of the article is available for download here