APA (7th ed.) Citation

Leonhardt, U. (1993). Quantum theory of simple optical instruments.

Chicago Style (17th ed.) Citation

Leonhardt, Ulf. Quantum Theory of Simple Optical Instruments. 1993.

MLA (9th ed.) Citation

Leonhardt, Ulf. Quantum Theory of Simple Optical Instruments. 1993.

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