Cita APA (7a ed.)

Staudt, W., & Hundius, O. (1907). Telegraphen-Schlüssel. Julius Springer.

Cita Chicago Style (17a ed.)

Staudt, Wilhelm, y Otto Hundius. Telegraphen-Schlüssel. Berlin: Julius Springer, 1907.

Cita MLA (9a ed.)

Staudt, Wilhelm, y Otto Hundius. Telegraphen-Schlüssel. Julius Springer, 1907.