Sakchai Ovatnupat. 1995. Vertical profile of lead accumulation in sediment of Chiang Mai Moat. Chiang Mai:Chiang Mai University;
Sakchai Ovatnupat. (1995) Vertical profile of lead accumulation in sediment of Chiang Mai Moat (รายงานผลงานวิจัย). Chiang Mai University:Chiang Mai.
Sakchai Ovatnupat. Vertical profile of lead accumulation in sediment of Chiang Mai Moat. Chiang Mai:Chiang Mai University, 1995.
Sakchai Ovatnupat. (1995) Vertical profile of lead accumulation in sediment of Chiang Mai Moat (รายงานผลงานวิจัย). Chiang Mai University:Chiang Mai.