Pacini, Cesare, Giulio Lazzerini, Paola Migliorini, and Concetta Vazzana. 2009. “An Indicator-Based Framework to Evaluate Sustainability of Farming Systems: Review of Applications in Tuscany”. Italian Journal of Agronomy 4 (1):23-40. https://doi.org/10.4081/ija.2009.1.23.