APA (7th ed.) Citation

Keller, H. (2004). The Song of the Stone Wall. Project Gutenberg.

Chicago Style (17th ed.) Citation

Keller, Helen. The Song of the Stone Wall. Project Gutenberg, 2004.

MLA (9th ed.) Citation

Keller, Helen. The Song of the Stone Wall. Project Gutenberg, 2004.

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