Wessel, T. (1984). "The Agricultural Foundations of Civilization". Journal of Agriculture and Human Values. 1 (2): 9–12. doi:10.1007/BF01530609.
Pei, Qing; Zhang, David Dian; Xu, Jingjing (August 2014). "Price Responses of Grain Market under Climate Change in Pre-industrial Western Europe by ARX Modelling". Proceedings of the 4th International Conference on Simulation and Modeling Methodologies, Technologies and Applications. pp. 811–817. doi:10.5220/0005025208110817. ISBN978-989-758-038-3. S2CID8045747.
Pei, Qing; Zhang, David Dian; Xu, Jingjing (August 2014). "Price Responses of Grain Market under Climate Change in Pre-industrial Western Europe by ARX Modelling". Proceedings of the 4th International Conference on Simulation and Modeling Methodologies, Technologies and Applications. pp. 811–817. doi:10.5220/0005025208110817. ISBN978-989-758-038-3. S2CID8045747.