APA (7th ed.) Citation

Gilson, C. (2012). Submarine U93. Project Gutenberg.

Chicago Style (17th ed.) Citation

Gilson, Charles. Submarine U93. Project Gutenberg, 2012.

MLA (9th ed.) Citation

Gilson, Charles. Submarine U93. Project Gutenberg, 2012.

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