APA (7th ed.) Citation

Hill, G. L. (2005). The Mystery of Mary. Project Gutenberg.

Chicago Style (17th ed.) Citation

Hill, Grace Livingston. The Mystery of Mary. Project Gutenberg, 2005.

MLA (9th ed.) Citation

Hill, Grace Livingston. The Mystery of Mary. Project Gutenberg, 2005.

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