[9]Архивирано на веб-сајту Wayback Machine (22. децембар 2015) Musk's Hyperloop math doesn't add up Greater Greater Washington Matt Johnson August 14, 2013
[8] Hyperloop Would Have 'Astronomical' Pricing, Unrealistic Construction Costs, Experts Say The Huffington Post Eleazar David Melendez August 14, 2013
[4]Архивирано на веб-сајту Wayback Machine (27. август 2015) Musk’s ‘Hyperloop’ on Track to Start Construction in 2016 Sustainable Brands Mike Hower August 24, 2015
[4]Архивирано на веб-сајту Wayback Machine (27. август 2015) Musk’s ‘Hyperloop’ on Track to Start Construction in 2016 Sustainable Brands Mike Hower August 24, 2015
[9]Архивирано на веб-сајту Wayback Machine (22. децембар 2015) Musk's Hyperloop math doesn't add up Greater Greater Washington Matt Johnson August 14, 2013