APA (7th ed.) Citation

Mignola, M., Stewart, D., & Robins, C. (2021). Hellboy universe essentials: Plague of frogs (First edition.). Dark Horse Books.

Chicago Style (17th ed.) Citation

Mignola, Mike, Dave Stewart, and Clem Robins. Hellboy Universe Essentials: Plague of Frogs. First edition. Milwaukie, OR: Dark Horse Books, 2021.

MLA (8th ed.) Citation

Mignola, Mike, et al. Hellboy Universe Essentials: Plague of Frogs. First edition. Dark Horse Books, 2021.

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