APA (7th ed.) Citation

Hume, F. (2003). The Secret Passage. Project Gutenberg.

Chicago Style (17th ed.) Citation

Hume, Fergus. The Secret Passage. Project Gutenberg, 2003.

MLA (9th ed.) Citation

Hume, Fergus. The Secret Passage. Project Gutenberg, 2003.

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