APA (7th ed.) Citation

Muir, J. (2010). My First Summer in the Sierra. Project Gutenberg.

Chicago Style (17th ed.) Citation

Muir, John. My First Summer in the Sierra. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Muir, John. My First Summer in the Sierra. Project Gutenberg, 2010.

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