APA (7th ed.) Citation

Huxley, T. H. (2005). The Advance of Science in the Last Half-Century. Project Gutenberg.

Chicago Style (17th ed.) Citation

Huxley, Thomas Henry. The Advance of Science in the Last Half-Century. Project Gutenberg, 2005.

MLA (9th ed.) Citation

Huxley, Thomas Henry. The Advance of Science in the Last Half-Century. Project Gutenberg, 2005.

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