APA (7th ed.) Citation

Newcomb, S. (2003). Side-Lights on Astronomy and Kindred Fields of Popular Science. Project Gutenberg.

Chicago Style (17th ed.) Citation

Newcomb, Simon. Side-Lights on Astronomy and Kindred Fields of Popular Science. Project Gutenberg, 2003.

MLA (9th ed.) Citation

Newcomb, Simon. Side-Lights on Astronomy and Kindred Fields of Popular Science. Project Gutenberg, 2003.

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