APA (7th ed.) Citation

Williamson, A. M. (2013). The Adventure of Princess Sylvia. Project Gutenberg.

Chicago Style (17th ed.) Citation

Williamson, A. M. The Adventure of Princess Sylvia. Project Gutenberg, 2013.

MLA (9th ed.) Citation

Williamson, A. M. The Adventure of Princess Sylvia. Project Gutenberg, 2013.

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