7,231 Siti Nur Jelita Sabran 2018-10-12 https://agupubs.onlinelibrary.wiley.com/doi/epdf/10.1029/2003GB002108 Leff, B., Ramankutty, N., & Foley, J. A. (2004). Geographic distribution of major crops across the world. Global Biogeochemical Cycles, 18(1).