Cita APA (7th ed.)
Signs [Signs (Chic)] NLMUID: 9875007.
Cita Chicago (17th ed.)
Signs [Signs (Chic)] NLMUID: 9875007.
Cita MLA (9th ed.)
Signs [Signs (Chic)] NLMUID: 9875007.
Atenció: Aquestes cites poden no estar 100% correctes.