Flyvbjerg, Bent; Skamris Holm, Mette K.; Buhl, Søren L. (30 June 2005). "How (In)accurate Are Demand Forecasts in Public Works Projects?: The Case of Transportation". Journal of the American Planning Association. 71 (2): 131–146. arXiv:1303.6654. doi:10.1080/01944360508976688.
Flyvbjerg, Bent; Skamris Holm, Mette K.; Buhl, Søren L. (30 June 2005). "How (In)accurate Are Demand Forecasts in Public Works Projects?: The Case of Transportation". Journal of the American Planning Association. 71 (2): 131–146. arXiv:1303.6654. doi:10.1080/01944360508976688.
"Major Roads of the United States". United States Department of the Interior. 2006-03-13. Diarsipkan dari versi asli tanggal 13 April 2007. Diakses tanggal 24 March 2007.Parameter |url-status= yang tidak diketahui akan diabaikan (bantuan)
"Major Roads of the United States". United States Department of the Interior. 2006-03-13. Diarsipkan dari versi asli tanggal 13 April 2007. Diakses tanggal 24 March 2007.Parameter |url-status= yang tidak diketahui akan diabaikan (bantuan)