APA (7th ed.) Citation

Rafferty, J. P., & Heintz, K. (2015). The Richter Scale and how it measures earthquake magnitude. Encyclopedia Britannica.

Chicago Style (17th ed.) Citation

Rafferty, John P., and Kurt Heintz. The Richter Scale and How It Measures Earthquake Magnitude. Chicago, IL: Encyclopedia Britannica, 2015.

MLA (9th ed.) Citation

Rafferty, John P., and Kurt Heintz. The Richter Scale and How It Measures Earthquake Magnitude. Encyclopedia Britannica, 2015.