APA (7th ed.) Citation

Ashton, J. (2013). Curious Creatures in Zoology. Project Gutenberg.

Chicago Style (17th ed.) Citation

Ashton, John. Curious Creatures in Zoology. Project Gutenberg, 2013.

MLA (9th ed.) Citation

Ashton, John. Curious Creatures in Zoology. Project Gutenberg, 2013.

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