Cita APA (7th ed.)
Urban, D. Zeichen + Signets. Signs + emblems.
Cita Chicago (17th ed.)
Urban, Dieter. Zeichen + Signets. Signs + Emblems.
Cita MLA (9th ed.)
Urban, Dieter. Zeichen + Signets. Signs + Emblems.
Atenció: Aquestes cites poden no estar 100% correctes.