APA (7th ed.) Citation

Library Pass, LLC, & Mignola, M. (2021). Hellboy Universe: The Secret Histories. Dark Horse.

Chicago Style (17th ed.) Citation

Library Pass, LLC, and Mike Mignola. Hellboy Universe: The Secret Histories. [United States]: Dark Horse, 2021.

MLA (9th ed.) Citation

Library Pass, LLC, and Mike Mignola. Hellboy Universe: The Secret Histories. Dark Horse, 2021.

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