APA (7th ed.) Citation

Stevens, F., & Sumner, H. (2006). Stonehenge Today and Yesterday. Project Gutenberg.

Chicago Style (17th ed.) Citation

Stevens, Frank, and Heywood Sumner. Stonehenge Today and Yesterday. Project Gutenberg, 2006.

MLA (9th ed.) Citation

Stevens, Frank, and Heywood Sumner. Stonehenge Today and Yesterday. Project Gutenberg, 2006.

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