APA (7th ed.) Citation

Robertson, A. F. (2011). The Boyhood of Great Inventors. Project Gutenberg.

Chicago Style (17th ed.) Citation

Robertson, A. Fraser. The Boyhood of Great Inventors. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Robertson, A. Fraser. The Boyhood of Great Inventors. Project Gutenberg, 2011.

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