BREDAHL, Maury E.; ABBOTT, Philip C.; REED, Michael R. Competitiveness of U.S. Agriculture and the Balance of Payments. Council for Agricultural Science and Technology (CAST), Ames, U.S.A., 1995. DOI: 10.62300/r2pq5s23. Disponível em: https://publications.cast-science.org/CAST/article/view/215. Acesso em: 2 jul. 2026.