Chotikhamjorn S. Study of Production Efficiency and Maize Farmers’ Incomes in Phetchabun Province. Humanities and Social Sciences Journal of Pibulsongkram Rajabhat University [internet]. 2021 Jun. 17 [cited 2025 Apr. 7];15(2):317-30. available from: https://so01.tci-thaijo.org/index.php/GraduatePSRU/article/view/239835