↑ Hayes Track Appliance Co. (1921). "Derails". ใน Howson, E.T.; Lewis, E.R.; Kellenberger, K.E. (บ.ก.). Maintenance of Way Cyclopedia. New York: Simmons-Boardman Publishing Co. p. 704 – โดยทาง Google Books.
Adams, Braman B.; Hitt, Rodney (1912) [1908]. Railway Signal Dictionary. New York: Simmons-Boardman Publishing Co. – โดยทาง google Books.
Kellenberger, K.E., บ.ก. (June 1919). "Use of Derails Varies Greatly on Railroads". Railway Signal Engineer. New York: Simmons-Boardman Publishing Co. 12 (6): 203–209 – โดยทาง Google Books.
Office of the Federal Register, National Archives and Records Administration (October 1, 2002). Code of Federal Regulations: Transportation. Washington, D.C.: Government Printing Office – โดยทาง Google Books.
