APA (7th ed.) Citation

Westerman, P. F., & Williams, C. F. (2013). The Rival Submarines. Project Gutenberg.

Chicago Style (17th ed.) Citation

Westerman, Percy F., and C. Fleming Williams. The Rival Submarines. Project Gutenberg, 2013.

MLA (9th ed.) Citation

Westerman, Percy F., and C. Fleming Williams. The Rival Submarines. Project Gutenberg, 2013.

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