APA (7th ed.) Citation

Packard, F. L. (2011). Doors of the Night. Project Gutenberg.

Chicago Style (17th ed.) Citation

Packard, Frank L. Doors of the Night. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Packard, Frank L. Doors of the Night. Project Gutenberg, 2011.

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