APA (7th ed.) Citation

Wheeler, F. G., & Williams, C. B. (2013). Billy Whiskers' Travels. Project Gutenberg.

Chicago Style (17th ed.) Citation

Wheeler, F. G., and Carll B. Williams. Billy Whiskers' Travels. Project Gutenberg, 2013.

MLA (9th ed.) Citation

Wheeler, F. G., and Carll B. Williams. Billy Whiskers' Travels. Project Gutenberg, 2013.

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