APA (7th ed.) Citation

Richardson, D., Beatty, G., & Shreeves, K. (2010). Open water: Diver manual. PADI.

Chicago Style (17th ed.) Citation

Richardson, Drew, Greg Beatty, and Karl Shreeves. Open Water: Diver Manual. California: PADI, 2010.

MLA (9th ed.) Citation

Richardson, Drew, et al. Open Water: Diver Manual. PADI, 2010.