APA (7th ed.) Citation

Williamson, C. N., Williamson, A. M., & Rowe, C. H. (2006). Secret History Revealed By Lady Peggy O'Malley. Project Gutenberg.

Chicago Style (17th ed.) Citation

Williamson, C. N., A. M. Williamson, and Clarence H. Rowe. Secret History Revealed By Lady Peggy O'Malley. Project Gutenberg, 2006.

MLA (9th ed.) Citation

Williamson, C. N., et al. Secret History Revealed By Lady Peggy O'Malley. Project Gutenberg, 2006.

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