APA (7th ed.) Citation

Wirt, M. A. (2011). Signal in the Dark. Project Gutenberg.

Chicago Style (17th ed.) Citation

Wirt, Mildred A. Signal in the Dark. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Wirt, Mildred A. Signal in the Dark. Project Gutenberg, 2011.

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