APA (7th ed.) Citation

Harvey, M. (2012). The Mystery of the Hidden Room. Project Gutenberg.

Chicago Style (17th ed.) Citation

Harvey, Marion. The Mystery of the Hidden Room. Project Gutenberg, 2012.

MLA (9th ed.) Citation

Harvey, Marion. The Mystery of the Hidden Room. Project Gutenberg, 2012.

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