Gedgaew, Chalee, Suchint Simaraks, และ A. Terry Rambo. 2017. “Hybrid tomato seed production practices and economic benefits: A case study in a rainfed area of Khon Kaen Province, Northeast Thailand”. วารสารแก่นเกษตร 45 (4):751-60. https://li01.tci-thaijo.org/index.php/agkasetkaj/article/view/252437.