APA (7th ed.) Citation

Piercy, W. D. (2011). Great Inventions and Discoveries. Project Gutenberg.

Chicago Style (17th ed.) Citation

Piercy, Willis Duff. Great Inventions and Discoveries. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Piercy, Willis Duff. Great Inventions and Discoveries. Project Gutenberg, 2011.

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