APA (7th ed.) Citation

Lettington, A. Optical Systems for Space and Defence. SPIE Digital Library.

Chicago Style (17th ed.) Citation

Lettington, Alan. Optical Systems for Space and Defence. SPIE Digital Library.

MLA (9th ed.) Citation

Lettington, Alan. Optical Systems for Space and Defence. SPIE Digital Library.

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