APA (7th ed.) Citation

Regehr, E. V., Amstrup, S. C., & Stirling, I. (2006). Polar bear population status in the southern Beaufort Sea. U.S. Geological Survey.

Chicago Style (17th ed.) Citation

Regehr, Eric V., Steven C. Amstrup, and Ian Stirling. Polar Bear Population Status in the Southern Beaufort Sea. Reston, Va.: U.S. Geological Survey, 2006.

MLA (9th ed.) Citation

Regehr, Eric V., et al. Polar Bear Population Status in the Southern Beaufort Sea. U.S. Geological Survey, 2006.