APA (7th ed.) Citation

Browne, H. (2010). Twelve Times Zero. Project Gutenberg.

Chicago Style (17th ed.) Citation

Browne, Howard. Twelve Times Zero. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Browne, Howard. Twelve Times Zero. Project Gutenberg, 2010.

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