Tansiri, Bandit, Yenjai Vasuwat, and Somsak Vangnai. 1974. “Rhizobium japonicum Strains Effective on Nitrogen Fixation with Soybean S.J. 2 in Korat Soil Series”. Agriculture and Natural Resources 8 (1). Bangkok, Thailand:19-22. https://li01.tci-thaijo.org/index.php/anres/article/view/240675.