Ralphs, J. D. (1985). Principles and practice of multi-frequency telegraphy. P. Peregrinus on behalf of the Institution of Electrical Engineers.
Chicago-Zitierstil (17. Ausg.)Ralphs, J. D. Principles and Practice of Multi-frequency Telegraphy. London, UK: P. Peregrinus on behalf of the Institution of Electrical Engineers, 1985.
MLA-Zitierstil (8. Ausg.)Ralphs, J. D. Principles and Practice of Multi-frequency Telegraphy. P. Peregrinus on behalf of the Institution of Electrical Engineers, 1985.
Achtung: Diese Zitate sind unter Umständen nicht zu 100% korrekt.