APA (7th ed.) Citation
Campbell, B. M., Vermeulen, S. J., Hansen, J., Jarvis, A., Thornton, P. K., & Wollenberg, E. K. (2011). How can we feed nine billion people while reducing GHG emissions?
Chicago Style (17th ed.) Citation
Campbell, Bruce M., Sonja J. Vermeulen, James Hansen, Andy Jarvis, Philip K. Thornton, and Eva Karoline Wollenberg. How Can We Feed Nine Billion People While Reducing GHG Emissions? 2011.
MLA (9th ed.) Citation
Campbell, Bruce M., et al. How Can We Feed Nine Billion People While Reducing GHG Emissions? 2011.
Warning: These citations may not always be 100% accurate.