APA (7th ed.) Citation

Grosse, C., Will, P., & Summers, M. (1927). Horrid mysteries: A story. R. Holden.

Chicago Style (17th ed.) Citation

Grosse, Carl, P. Will, and Montague Summers. Horrid Mysteries: A Story. London: R. Holden, 1927.

MLA (9th ed.) Citation

Grosse, Carl, et al. Horrid Mysteries: A Story. R. Holden, 1927.