Skateboarding (неопр.). Pennsylvania Avenue National Historic Site Management Plan: Visitor Information, Education and Enjoyment 24–25. Washington, D.C.: National Mall and Memorial Parks: National Park Service: United States Department of the Interior (апрель 2014). — «Skateboarding damages stonework, walls, steps, and sculpture in some areas and presents a persistent law enforcement and management challenge. Damaged areas include stone facing on memorials, benches, and other surfaces. Moreover, popular websites advertise the attractiveness of these areas for skateboarding, which indicates the large scope of this challenge. .... Actions: .... In park areas replace and maintain “No Skateboarding” signs that have been vandalized.» Дата обращения: 29 марта 2017. Архивировано 4 марта 2017 года.
Ocean Howell.Extreme Market Research (неопр.). Topic Magazine. Topic Magazine (2003). Дата обращения: 17 августа 2012. Архивировано 22 августа 2012 года.
Steve Cave, about.com.[skateboard.about.com/cs/boardscience/a/brief_history_2.htm Skateboarding: A Brief History (page 2)] (неопр.). Дата обращения: 13 декабря 2006. Архивировано 14 февраля 2007 года.
Skateboarding (неопр.). Pennsylvania Avenue National Historic Site Management Plan: Visitor Information, Education and Enjoyment 24–25. Washington, D.C.: National Mall and Memorial Parks: National Park Service: United States Department of the Interior (апрель 2014). — «Skateboarding damages stonework, walls, steps, and sculpture in some areas and presents a persistent law enforcement and management challenge. Damaged areas include stone facing on memorials, benches, and other surfaces. Moreover, popular websites advertise the attractiveness of these areas for skateboarding, which indicates the large scope of this challenge. .... Actions: .... In park areas replace and maintain “No Skateboarding” signs that have been vandalized.» Дата обращения: 29 марта 2017. Архивировано 4 марта 2017 года.
[skateboard.about.com/cs/boardscience/a/brief_history.htm Skateboarding: A Brief History (page 1)] (неопр.). Дата обращения: 10 октября 2010. Архивировано 26 февраля 2012 года.
Ocean Howell.Extreme Market Research (неопр.). Topic Magazine. Topic Magazine (2003). Дата обращения: 17 августа 2012. Архивировано 22 августа 2012 года.
