APA (7th ed.) Citation

Piper, H. B. (2006). Police Operation. Project Gutenberg.

Chicago Style (17th ed.) Citation

Piper, H. Beam. Police Operation. Project Gutenberg, 2006.

MLA (9th ed.) Citation

Piper, H. Beam. Police Operation. Project Gutenberg, 2006.

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