Cita APA (7a ed.)
Siebert, S., Döll, P., & Portman, F. T. (2014). Cropping intensity. International Food Policy Research Institute.
Cita Chicago Style (17a ed.)
Siebert, Stefan, Petra Döll, y Felix T. Portman. Cropping Intensity. International Food Policy Research Institute, 2014.
Cita MLA (9a ed.)
Siebert, Stefan, et al. Cropping Intensity. International Food Policy Research Institute, 2014.
Precaución: Estas citas no son 100% exactas.