APA (7th ed.) Citation

Thomson, J., Turk, W. E., & Beesley, M. J. (1969). Frequency conversion. Wykeham Publications.

Chicago Style (17th ed.) Citation

Thomson, J., W. E. Turk, and M. J. Beesley. Frequency Conversion. London: Wykeham Publications, 1969.

MLA (9th ed.) Citation

Thomson, J., et al. Frequency Conversion. Wykeham Publications, 1969.