CHOTIKHAMJORN, S. . Study of Production Efficiency and Maize Farmers’ Incomes in Phetchabun Province. Humanities and Social Sciences Journal of Pibulsongkram Rajabhat University, [S. l.], v. 15, n. 2, p. 317–330, 2021. DOI: 10.14456/psruhss.2021.25. Disponível em: https://so01.tci-thaijo.org/index.php/GraduatePSRU/article/view/239835. Acesso em: 6 may. 2024.