APA (7th ed.) Citation

Spencer, H. (2009). Essays: Scientific, Political, and Speculative, Vol. I. Project Gutenberg.

Chicago Style (17th ed.) Citation

Spencer, Herbert. Essays: Scientific, Political, and Speculative, Vol. I. Project Gutenberg, 2009.

MLA (9th ed.) Citation

Spencer, Herbert. Essays: Scientific, Political, and Speculative, Vol. I. Project Gutenberg, 2009.

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