Zulkarnain, Zulkarnain, Wan Abbas Zakaria, Dwi Haryono, Ktut Murniarti, y Muhammad Irfan Affandi. 2019. «Transaction Cost Structure on Agribusiness System of Cassava in Lampung Province». Opción 35 (agosto), 11103-121. https://produccioncientifica.luz.edu.ve/index.php/opcion/article/view/32283.