APA (7th ed.) Citation

Olcott, W. T. (2007). A Field Book of the Stars. Project Gutenberg.

Chicago Style (17th ed.) Citation

Olcott, William Tyler. A Field Book of the Stars. Project Gutenberg, 2007.

MLA (9th ed.) Citation

Olcott, William Tyler. A Field Book of the Stars. Project Gutenberg, 2007.

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