Wanchai Sangsuk. 2008. Petrification of woods in the Tha Chang sand pit, Nakhon Ratchasima province. Field of Study Geology, Chiang Mai University;
Wanchai Sangsuk. (2008) Petrification of woods in the Tha Chang sand pit, Nakhon Ratchasima province . Chiang Mai University/Chiang Mai.
Wanchai Sangsuk. Petrification of woods in the Tha Chang sand pit, Nakhon Ratchasima province. . Chiang Mai:Chiang Mai University, 2008.
Wanchai Sangsuk. (2008) Petrification of woods in the Tha Chang sand pit, Nakhon Ratchasima province . Chiang Mai University/Chiang Mai.