APA (7th ed.) Citation

Phelps, E. S., Ward, H. D., & Merrill, F. T. (2009). A Lost Hero. Project Gutenberg.

Chicago Style (17th ed.) Citation

Phelps, Elizabeth Stuart, Herbert D. Ward, and Frank T. Merrill. A Lost Hero. Project Gutenberg, 2009.

MLA (9th ed.) Citation

Phelps, Elizabeth Stuart, et al. A Lost Hero. Project Gutenberg, 2009.

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