APA (7th ed.) Citation

Hull, E. (2010). Volcanoes: Past and Present. Project Gutenberg.

Chicago Style (17th ed.) Citation

Hull, Edward. Volcanoes: Past and Present. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Hull, Edward. Volcanoes: Past and Present. Project Gutenberg, 2010.

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