APA (7th ed.) Citation

Castle, A., & Summers, L. (2008). The Perfectionists. Project Gutenberg.

Chicago Style (17th ed.) Citation

Castle, Arnold, and Leo Summers. The Perfectionists. Project Gutenberg, 2008.

MLA (9th ed.) Citation

Castle, Arnold, and Leo Summers. The Perfectionists. Project Gutenberg, 2008.

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