APA (7th ed.) Citation

William Gaertner and Company. (2008). Astronomical Instruments and Accessories. Project Gutenberg.

Chicago Style (17th ed.) Citation

William Gaertner and Company. Astronomical Instruments and Accessories. Project Gutenberg, 2008.

MLA (9th ed.) Citation

William Gaertner and Company. Astronomical Instruments and Accessories. Project Gutenberg, 2008.

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