APA (7th ed.) Citation

Al-Khatatbeh, Y., & Lee, K. K. (2014). From superhard to hard: A review of transition metal dioxides TiO2, ZrO2, and HfO2 hardness.

Chicago Style (17th ed.) Citation

Al-Khatatbeh, Y., and K. K.M Lee. From Superhard to Hard: A Review of Transition Metal Dioxides TiO2, ZrO2, and HfO2 Hardness. 2014.

MLA (8th ed.) Citation

Al-Khatatbeh, Y., and K. K.M Lee. From Superhard to Hard: A Review of Transition Metal Dioxides TiO2, ZrO2, and HfO2 Hardness. 2014.

Warning: These citations may not always be 100% accurate.