APA (7th ed.) Citation

Camp, W. (2010). The Gray Mask. Project Gutenberg.

Chicago Style (17th ed.) Citation

Camp, Wadsworth. The Gray Mask. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Camp, Wadsworth. The Gray Mask. Project Gutenberg, 2010.

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