Nantakorn Boonkerd และ Precha Wadisirisuk; Vitaya Thannanusont. (1993) Survey on Indigenous Population of Peanut Rhizobia under Different Cropping Systems. <i>Thai Agricultural Research Journal</i>, <i>11</i>(3), 114-119.Nantakorn Boonkerd และ Precha Wadisirisuk; Vitaya Thannanusont. "Survey on Indigenous Population of Peanut Rhizobia under Different Cropping Systems". Thai Agricultural Research Journal 11 (1993):114-119.Nantakorn Boonkerd และ Precha Wadisirisuk; Vitaya Thannanusont. Survey on Indigenous Population of Peanut Rhizobia under Different Cropping Systems. Department of Agriculture:ม.ป.ท. 1993.