APA   Click to copy
Clapp, J., Newell, P., & Brent, Z. W. (2018). The global political economy of climate change, agriculture and food systems.

Chicago/Turabian   Click to copy
Clapp, J., P. Newell, and Zoe W. Brent. “The Global Political Economy of Climate Change, Agriculture and Food Systems” (2018).

MLA   Click to copy
Clapp, J., et al. The Global Political Economy of Climate Change, Agriculture and Food Systems. 2018.

@article{j2018a,
  title = {The global political economy of climate change, agriculture and food systems},
  year = {2018},
  author = {Clapp, J. and Newell, P. and Brent, Zoe W.}
}