APA (7th ed.) Citation

Welford, W. T. (1989). Aberrations of optical systems. A. Hilger.

Chicago Style (17th ed.) Citation

Welford, W. T. Aberrations of Optical Systems. Bristol ; Philadelphia: A. Hilger, 1989.

MLA (9th ed.) Citation

Welford, W. T. Aberrations of Optical Systems. A. Hilger, 1989.