2009 Edition Chapter 7B. School Signs. Manual on Uniform Traffic Control Devices. The United States Department of Transportation. [6 June 2012]. (原始内容存档于2017-09-02).
Staff. Chapter 7: Parallel Parking. Driver's Manual and Study Guide. New York State Department of Motor Vehicles. October 2011 [March 16, 2012]. (原始内容存档于2013-10-30).
Staff. Chapter 7: Parallel Parking. Driver's Manual and Study Guide. New York State Department of Motor Vehicles. October 2011 [March 16, 2012]. (原始内容存档于2013-10-30).
2009 Edition Chapter 7B. School Signs. Manual on Uniform Traffic Control Devices. The United States Department of Transportation. [6 June 2012]. (原始内容存档于2017-09-02).