Lehner, E. (1950). Symbols, signs and Signets. Dover.
Cita Chicago (17th ed.)Lehner, Ernst. Symbols, Signs and Signets. Nueva York: Dover, 1950.
Cita MLA (9th ed.)Lehner, Ernst. Symbols, Signs and Signets. Dover, 1950.
Atenció: Aquestes cites poden no estar 100% correctes.