Pinruthai Khongthong และ Suwaree Namwong. (2016) Cultural tourism destination development of Nakhon Si Thammarat province. National Institute of Development Administration:ม.ป.ท.Pinruthai Khongthong และ Suwaree Namwong. 2016. Cultural tourism destination development of Nakhon Si Thammarat province. ม.ป.ท.:National Institute of Development Administration;Pinruthai Khongthong และ Suwaree Namwong. Cultural tourism destination development of Nakhon Si Thammarat province. ม.ป.ท.:National Institute of Development Administration, 2016. Print.