APA (7th ed.) Citation

(2011). Diary of a U-Boat Commander. Project Gutenberg.

Chicago Style (17th ed.) Citation

Diary of a U-Boat Commander. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Diary of a U-Boat Commander. Project Gutenberg, 2011.

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