Cita APA (7a ed.)

Helfman, G. S., & Burgess, G. H. (2014). Sharks: The Animal Answer Guide. The Johns Hopkins University Press.

Cita Chicago Style (17a ed.)

Helfman, Gene S., y George H. Burgess. Sharks: The Animal Answer Guide. Baltimore: The Johns Hopkins University Press, 2014.

Cita MLA (8a ed.)

Helfman, Gene S., y George H. Burgess. Sharks: The Animal Answer Guide. The Johns Hopkins University Press, 2014.