Smutrakalin Varada topnga สิงห kan and phon no maneerat (2550 (2007)). Training facilities Children primary. The second printing. Bangkok: suan Dusit rajabhat University.
Nai Gan industrial district is D and nut worrada gem. (2550). Child rearing preschool children. Printing times 2. Bangkok: Suan Dusit Rajabhat University.