APA (7th ed.) Citation

Heintz, K., & Leonard, M. (2016). Learn what the atmosphere is made of. Encyclopedia Britannica.

Chicago Style (17th ed.) Citation

Heintz, Kurt, and Melinda Leonard. Learn What the Atmosphere Is Made of. Chicago, IL: Encyclopedia Britannica, 2016.

MLA (9th ed.) Citation

Heintz, Kurt, and Melinda Leonard. Learn What the Atmosphere Is Made of. Encyclopedia Britannica, 2016.