Chichaya Changrian และผู้แต่งคนอื่นๆ. (2010) Happiness and its influencing factors among household heads in urban and rural areas of Thailand. National Institute of Development Administration:ม.ป.ท.Chichaya Changrian และผู้แต่งคนอื่นๆ. 2010. Happiness and its influencing factors among household heads in urban and rural areas of Thailand. ม.ป.ท.:National Institute of Development Administration;Chichaya Changrian และผู้แต่งคนอื่นๆ. Happiness and its influencing factors among household heads in urban and rural areas of Thailand. ม.ป.ท.:National Institute of Development Administration, 2010. Print.