APA (7th ed.) Citation

Mignola, M. (2021). Hellboy universe: The secret histories. Dark Horse Comics, LLC..

Chicago Style (17th ed.) Citation

Mignola, Mike. Hellboy Universe: The Secret Histories. Cleveland: Dark Horse Comics, LLC., 2021.

MLA (8th ed.) Citation

Mignola, Mike. Hellboy Universe: The Secret Histories. Dark Horse Comics, LLC., 2021.

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