Komsan Nakornsri และ Prasan Vongsaroj; Samran Inthalang. (1999) Rate of Azolla (Azolla pinnata B.Br.) on Weed Control in Pre-Germinated Direct-Seeded Rice. <i>Thai Agricultural Research Journal</i>, <i>17</i>(3), 303-309.Komsan Nakornsri และ Prasan Vongsaroj; Samran Inthalang. "Rate of Azolla (Azolla pinnata B.Br.) on Weed Control in Pre-Germinated Direct-Seeded Rice". Thai Agricultural Research Journal 17 (1999):303-309.Komsan Nakornsri และ Prasan Vongsaroj; Samran Inthalang. Rate of Azolla (Azolla pinnata B.Br.) on Weed Control in Pre-Germinated Direct-Seeded Rice. Department of Agriculture:ม.ป.ท. 1999.