APA (7th ed.) Citation

Lewis, W. T. (2011). Friction, Lubrication and the Lubricants in Horology. Project Gutenberg.

Chicago Style (17th ed.) Citation

Lewis, William T. Friction, Lubrication and the Lubricants in Horology. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Lewis, William T. Friction, Lubrication and the Lubricants in Horology. Project Gutenberg, 2011.

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