Thanakrit Thongkhao และผู้แต่งคนอื่นๆ. (2012) Engineering and physical properties of residual soil from landslide hazard area in Amphoe Chiang Klang, Changwat Nan, Thailand. Chulalongkorn University:ม.ป.ท.Thanakrit Thongkhao และผู้แต่งคนอื่นๆ. 2012. Engineering and physical properties of residual soil from landslide hazard area in Amphoe Chiang Klang, Changwat Nan, Thailand. ม.ป.ท.:Chulalongkorn University;Thanakrit Thongkhao และผู้แต่งคนอื่นๆ. Engineering and physical properties of residual soil from landslide hazard area in Amphoe Chiang Klang, Changwat Nan, Thailand. ม.ป.ท.:Chulalongkorn University, 2012. Print.