http://www.thapra.lib.su.ac.th/thesis/showthesis_th.asp?id=0000012084
http://www.thapra.lib.su.ac.th/thesis/showthesis_th.asp?id=0000012084
Nakhon Pathom Rajabhat University
Nakhon Pathom Rajabhat University 85 Malaiman Road, Muang, Nakhon Pathom 73000 Thailand