United States Department of Transportation. Federal Highway Administration. Manual on Uniform Traffic Control Devices(PDF). Federal Highway Administration: 6F–33. December 2007 [2009-10-24]. （原始内容(PDF)存档于2021-03-19）.
Official Florida Driver's Handbook 2008 (1 October 2008), Division of Driver's Licenses, Florida Department of Highway Safety and Motor Vehicles! Web-based PDF （页面存档备份，存于互联网档案馆）. Chapter 4, Section 7 "Special Signs." Channeling Devices.
web.archive.org
Official Florida Driver's Handbook 2008 (1 October 2008), Division of Driver's Licenses, Florida Department of Highway Safety and Motor Vehicles! Web-based PDF （页面存档备份，存于互联网档案馆）. Chapter 4, Section 7 "Special Signs." Channeling Devices.
United States Department of Transportation. Federal Highway Administration. Manual on Uniform Traffic Control Devices(PDF). Federal Highway Administration: 6F–33. December 2007 [2009-10-24]. （原始内容(PDF)存档于2021-03-19）.
