APA (7th ed.) Citation

Keller, C. U. Field Guide to Astronomical Instrumentation. SPIE Digital Library.

Chicago Style (17th ed.) Citation

Keller, Christoph U. Field Guide to Astronomical Instrumentation. SPIE Digital Library.

MLA (8th ed.) Citation

Keller, Christoph U. Field Guide to Astronomical Instrumentation. SPIE Digital Library.

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