APA (7th ed.) Citation

Graf, H., Kirchner, I., & Schult, I. (1996). Modelling Mt. Pinatubo climate effects.

Chicago Style (17th ed.) Citation

Graf, H., I. Kirchner, and I. Schult. Modelling Mt. Pinatubo Climate Effects. 1996.

MLA (9th ed.) Citation

Graf, H., et al. Modelling Mt. Pinatubo Climate Effects. 1996.