APA (7th ed.) Citation

Holland, R. S. (2013). Historic Inventions. Project Gutenberg.

Chicago Style (17th ed.) Citation

Holland, Rupert S. Historic Inventions. Project Gutenberg, 2013.

MLA (9th ed.) Citation

Holland, Rupert S. Historic Inventions. Project Gutenberg, 2013.

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