Aphiphan Pookpakdi, Harisadee Pataradilok, Suwit Laohasiriwong, and Adisak Suwitawatch. “Difference in Yield and Growth of Soybean Cultivar S.J.4 When Planted at Khon Kaen and Kamphaeng Saen Using Different Planting Dates and Plant Population Densities”. Agriculture and Natural Resources 28, no. 1 (March 31, 1994): 1–13. accessed September 17, 2026. https://li01.tci-thaijo.org/index.php/anres/article/view/241369.