APA (7th ed.) Citation

Emerton, J. H. (2013). The Common Spiders of the United States. Project Gutenberg.

Chicago Style (17th ed.) Citation

Emerton, James Henry. The Common Spiders of the United States. Project Gutenberg, 2013.

MLA (9th ed.) Citation

Emerton, James Henry. The Common Spiders of the United States. Project Gutenberg, 2013.

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