APA (7th ed.) Citation

Thorne, P., & Thorne, M. (2011). The Secret Toll. Project Gutenberg.

Chicago Style (17th ed.) Citation

Thorne, Paul, and Mabel Thorne. The Secret Toll. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Thorne, Paul, and Mabel Thorne. The Secret Toll. Project Gutenberg, 2011.

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