APA (7th ed.) Citation

Hornung, E. W., & Steele, F. D. (2011). The Crime Doctor. Project Gutenberg.

Chicago Style (17th ed.) Citation

Hornung, E. W., and Frederic Dorr Steele. The Crime Doctor. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Hornung, E. W., and Frederic Dorr Steele. The Crime Doctor. Project Gutenberg, 2011.

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