APA (7th ed.) Citation

Spurgeon, C. H. (2013). The Art of Illustration. Project Gutenberg.

Chicago Style (17th ed.) Citation

Spurgeon, Charles Haddon. The Art of Illustration. Project Gutenberg, 2013.

MLA (9th ed.) Citation

Spurgeon, Charles Haddon. The Art of Illustration. Project Gutenberg, 2013.

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