APA (7th ed.) Citation

Forester, C. S. (1956). Mr. midshipman hornblower. Penguin Books.

Chicago Style (17th ed.) Citation

Forester, C. S. Mr. Midshipman Hornblower. London: Penguin Books, 1956.

MLA (9th ed.) Citation

Forester, C. S. Mr. Midshipman Hornblower. Penguin Books, 1956.