APA (7th ed.) Citation

Lubbock, J. (2011). On the Origin and Metamorphoses of Insects. Project Gutenberg.

Chicago Style (17th ed.) Citation

Lubbock, John. On the Origin and Metamorphoses of Insects. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Lubbock, John. On the Origin and Metamorphoses of Insects. Project Gutenberg, 2011.

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