APA (7th ed.) Citation

Heintz, K., & Abdullah, M. (2013). Learn how minerals can be identified by physical properties such as hardness and color. Encyclopedia Britannica.

Chicago Style (17th ed.) Citation

Heintz, Kurt, and Mansur Abdullah. Learn How Minerals Can Be Identified by Physical Properties Such as Hardness and Color. Chicago, IL: Encyclopedia Britannica, 2013.

MLA (9th ed.) Citation

Heintz, Kurt, and Mansur Abdullah. Learn How Minerals Can Be Identified by Physical Properties Such as Hardness and Color. Encyclopedia Britannica, 2013.