APA (7th ed.) Citation

Whittaker, E. T. (1971). The theory of optical instruments. Hafner.

Chicago Style (17th ed.) Citation

Whittaker, Edmund T. The Theory of Optical Instruments. New York: Hafner, 1971.

MLA (9th ed.) Citation

Whittaker, Edmund T. The Theory of Optical Instruments. Hafner, 1971.