APA (7th ed.) Citation
Siebert, S., Döll, P., & Portman, F. T. (2014). Cropping intensity. International Food Policy Research Institute.
Chicago Style (17th ed.) Citation
Siebert, Stefan, Petra Döll, and Felix T. Portman. Cropping Intensity. International Food Policy Research Institute, 2014.
MLA (9th ed.) Citation
Siebert, Stefan, et al. Cropping Intensity. International Food Policy Research Institute, 2014.
Warning: These citations may not always be 100% accurate.