APA (7th ed.) Citation

Helfman, G. S. (2011). Fishes: The animal answer guide. Johns Hopkins University Press.

Chicago Style (17th ed.) Citation

Helfman, Gene S. Fishes: The Animal Answer Guide. Baltimore: Johns Hopkins University Press, 2011.

MLA (9th ed.) Citation

Helfman, Gene S. Fishes: The Animal Answer Guide. Johns Hopkins University Press, 2011.