APA (7th ed.) Citation

Lloyd, L. S. (1938). Decibels and phons, a musical analogy. Oxford University Press.

Chicago Style (17th ed.) Citation

Lloyd, Llewelyn S. Decibels and Phons, a Musical Analogy. London, New York [etc.]: Oxford University Press, 1938.

MLA (9th ed.) Citation

Lloyd, Llewelyn S. Decibels and Phons, a Musical Analogy. Oxford University Press, 1938.