APA (7th ed.) Citation

Okey, T., Kimball, K., & Ward, O. F. M. (2014). Paris and its Story. Project Gutenberg.

Chicago Style (17th ed.) Citation

Okey, Thomas, Katherine Kimball, and O. F. M. Ward. Paris and Its Story. Project Gutenberg, 2014.

MLA (9th ed.) Citation

Okey, Thomas, et al. Paris and Its Story. Project Gutenberg, 2014.

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