APA-referens (7:e uppl.)

Não informado. (2011). Railway Signaling and Communications. Simmons Boardman Publishing.

Chicago-referens (17:e uppl.)

Não informado. Railway Signaling and Communications. Chicago, Ill: Simmons Boardman Publishing, 2011.

MLA-referens (8:e uppl.)

Não informado. Railway Signaling and Communications. Simmons Boardman Publishing, 2011.

Varning: dessa hänvisningar är inte alltid fullständigt riktiga.