U.S. Agency for International Development. 9 steps to profitable corn production. s.n.
Citazione stile Chigago Style (17a edizione)U.S. Agency for International Development. 9 Steps to Profitable Corn Production. [Manila: s.n.
Citatione MLA (9a ed.)U.S. Agency for International Development. 9 Steps to Profitable Corn Production. s.n.
Attenzione: Queste citazioni potrebbero non essere precise al 100%.