Nonthacha Chaitawittanun และ Duangduen Bhanthumnavin. (2020) Psychological characteristics and situational factors as correlate of preparation for quality aging in undergraduate students. National Institute of Development Administration:ม.ป.ท.Nonthacha Chaitawittanun และ Duangduen Bhanthumnavin. 2020. Psychological characteristics and situational factors as correlate of preparation for quality aging in undergraduate students. ม.ป.ท.:National Institute of Development Administration;Nonthacha Chaitawittanun และ Duangduen Bhanthumnavin. Psychological characteristics and situational factors as correlate of preparation for quality aging in undergraduate students. ม.ป.ท.:National Institute of Development Administration, 2020. Print.