Mignola, M. (2021). Hellboy universe: The secret histories. Dark Horse Comics, LLC..
Cita Chicago Style (17a ed.)Mignola, Mike. Hellboy Universe: The Secret Histories. Cleveland: Dark Horse Comics, LLC., 2021.
Cita MLA (8a ed.)Mignola, Mike. Hellboy Universe: The Secret Histories. Dark Horse Comics, LLC., 2021.
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