Merma, Isaías, and Alberto Julca. “Farmers Typology and Crops Sustainability in Alto Urubamba, La Convencion – Cusco”. Scientia Agropecuaria 3, no. 2 (June 19, 2012): 149–159. Accessed September 10, 2026. https://revistas.unitru.edu.pe/index.php/scientiaagrop/article/view/79.