APA (7th ed.) Citation

MacDonald, G., & Smith, J. W. (2010). The Princess and the Goblin. Project Gutenberg.

Chicago Style (17th ed.) Citation

MacDonald, George, and Jessie Willcox Smith. The Princess and the Goblin. Project Gutenberg, 2010.

MLA (9th ed.) Citation

MacDonald, George, and Jessie Willcox Smith. The Princess and the Goblin. Project Gutenberg, 2010.

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