APA (7th ed.) Citation

Green, A. K. (2010). X Y Z: A Detective Story. Project Gutenberg.

Chicago Style (17th ed.) Citation

Green, Anna Katharine. X Y Z: A Detective Story. Project Gutenberg, 2010.

MLA (9th ed.) Citation

Green, Anna Katharine. X Y Z: A Detective Story. Project Gutenberg, 2010.

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