APA (7th ed.) Citation

Voltaire, Smollett, T., Fleming, W. F., Morley, J., & Leigh, O. H. G. (2011). A Philosophical Dictionary, Volume 6. Project Gutenberg.

Chicago Style (17th ed.) Citation

Voltaire, T. Smollett, William F. Fleming, John Morley, and Oliver Herbrand Gordon Leigh. A Philosophical Dictionary, Volume 6. Project Gutenberg, 2011.

MLA (9th ed.) Citation

Voltaire, et al. A Philosophical Dictionary, Volume 6. Project Gutenberg, 2011.

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