APA (7th ed.) Citation

Greenberg, I., Greenberg, J., & Greenberg, M. (1981). Sharks and other dangerous sea creatures. Seahawk.

Chicago Style (17th ed.) Citation

Greenberg, I., J. Greenberg, and M. Greenberg. Sharks and Other Dangerous Sea Creatures. Miama, Fl: Seahawk, 1981.

MLA (9th ed.) Citation

Greenberg, I., et al. Sharks and Other Dangerous Sea Creatures. Seahawk, 1981.