APA (7th ed.) Citation

Spencer, H. (2012). Illustrations of Universal Progress: A Series of Discussions. Project Gutenberg.

Chicago Style (17th ed.) Citation

Spencer, Herbert. Illustrations of Universal Progress: A Series of Discussions. Project Gutenberg, 2012.

MLA (9th ed.) Citation

Spencer, Herbert. Illustrations of Universal Progress: A Series of Discussions. Project Gutenberg, 2012.

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