APA (7th ed.) Citation

Osborne, T. M., & Wheeler, T. R. (2013, January). Evidence for a climate signal in trends of global crop yield variability over the past 50 years. Environmental Research Letters.

Chicago Style (17th ed.) Citation

Osborne, T M., and T R. Wheeler. "Evidence for a Climate Signal in Trends of Global Crop Yield Variability over the Past 50 Years." Environmental Research Letters Jan. 2013.

MLA (9th ed.) Citation

Osborne, T M., and T R. Wheeler. "Evidence for a Climate Signal in Trends of Global Crop Yield Variability over the Past 50 Years." Environmental Research Letters, Jan. 2013.