Não informado. (2011). Railway Signaling. Simmons Boardman Publishing.
Chicagoスタイル(17版)引用形式Não informado. Railway Signaling. Chicago, Ill: Simmons Boardman Publishing, 2011.
MLA(8版)引用形式Não informado. Railway Signaling. Simmons Boardman Publishing, 2011.
警告: この引用は必ずしも正確ではありません.