APA (7th ed.) Citation

Leya, I., Schonbachler, M., Kraehenbuehl, U., & Halliday, A. (2009). Titanium isotopes in the solar system.

Chicago Style (17th ed.) Citation

Leya, I., M. Schonbachler, U. Kraehenbuehl, and A. Halliday. Titanium Isotopes in the Solar System. 2009.

MLA (9th ed.) Citation

Leya, I., et al. Titanium Isotopes in the Solar System. 2009.