APA (7th ed.) Citation

Marshall, E. (2004). The Sky Line of Spruce. Project Gutenberg.

Chicago Style (17th ed.) Citation

Marshall, Edison. The Sky Line of Spruce. Project Gutenberg, 2004.

MLA (9th ed.) Citation

Marshall, Edison. The Sky Line of Spruce. Project Gutenberg, 2004.

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