APA (7th ed.) Citation

Shiel, M. P. (2004). The Purple Cloud. Project Gutenberg.

Chicago Style (17th ed.) Citation

Shiel, M. P. The Purple Cloud. Project Gutenberg, 2004.

MLA (9th ed.) Citation

Shiel, M. P. The Purple Cloud. Project Gutenberg, 2004.

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