APA (7th ed.) Citation

Gorlinski, G., & Heintz, K. (2011). Learn about the different stages in a lunar eclipse. Encyclopedia Britannica.

Chicago Style (17th ed.) Citation

Gorlinski, Gini, and Kurt Heintz. Learn About the Different Stages in a Lunar Eclipse. Chicago, IL: Encyclopedia Britannica, 2011.

MLA (9th ed.) Citation

Gorlinski, Gini, and Kurt Heintz. Learn About the Different Stages in a Lunar Eclipse. Encyclopedia Britannica, 2011.