Sirait และผู้แต่งคนอื่นๆ. 2005. Biopile for removal of soil contaminants from petroleum production. Field of Study Environmental Science, Chiang Mai University;
Sirait และผู้แต่งคนอื่นๆ. (2005) Biopile for removal of soil contaminants from petroleum production . Chiang Mai University/Chiang Mai.
Sirait และผู้แต่งคนอื่นๆ. Biopile for removal of soil contaminants from petroleum production. . Chiang Mai:Chiang Mai University, 2005.
Sirait และผู้แต่งคนอื่นๆ. (2005) Biopile for removal of soil contaminants from petroleum production . Chiang Mai University/Chiang Mai.