APA (7th ed.) Citation

Ralphs, J. D. (1985). Principles and practice of multi-frequency telegraphy. P. Peregrinus on behalf of the Institution of Electrical Engineers.

Chicago Style (17th ed.) Citation

Ralphs, J. D. Principles and Practice of Multi-frequency Telegraphy. London, UK: P. Peregrinus on behalf of the Institution of Electrical Engineers, 1985.

MLA (9th ed.) Citation

Ralphs, J. D. Principles and Practice of Multi-frequency Telegraphy. P. Peregrinus on behalf of the Institution of Electrical Engineers, 1985.

Warning: These citations may not always be 100% accurate.