APA (7th ed.) Citation

Mabie, H. W., & Stephens, K. (2003). Heroes Every Child Should Know. Project Gutenberg.

Chicago Style (17th ed.) Citation

Mabie, Hamilton Wright, and Kate Stephens. Heroes Every Child Should Know. Project Gutenberg, 2003.

MLA (9th ed.) Citation

Mabie, Hamilton Wright, and Kate Stephens. Heroes Every Child Should Know. Project Gutenberg, 2003.

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