APA (7th ed.) Citation

Thornbury, W., Fairholt, F. W., & Walford, E. (2012). Haunted London. Project Gutenberg.

Chicago Style (17th ed.) Citation

Thornbury, Walter, F. W. Fairholt, and Edward Walford. Haunted London. Project Gutenberg, 2012.

MLA (9th ed.) Citation

Thornbury, Walter, et al. Haunted London. Project Gutenberg, 2012.

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