APA (7th ed.) Citation

Sheldon, W. J. (2009). This is Klon Calling. Project Gutenberg.

Chicago Style (17th ed.) Citation

Sheldon, Walter J. This Is Klon Calling. Project Gutenberg, 2009.

MLA (9th ed.) Citation

Sheldon, Walter J. This Is Klon Calling. Project Gutenberg, 2009.

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