Kangsopa , Jakkrapong, และ Boonmee Siri. 2017. “Improvement of lettuce germination and seedling growth by seed pelleting with ammonium nitrate compounds”. วารสารแก่นเกษตร 45 (4):741-50. https://li01.tci-thaijo.org/index.php/agkasetkaj/article/view/252436.