Não informado. (2011). Railway Signaling and Communications. Simmons Boardman Publishing.
Cita Chicago Style (17a ed.)Não informado. Railway Signaling and Communications. Chicago, Ill: Simmons Boardman Publishing, 2011.
Cita MLA (8a ed.)Não informado. Railway Signaling and Communications. Simmons Boardman Publishing, 2011.
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