LUO LU2020-03-062020-03-061999https://scholars.lib.ntu.edu.tw/handle/123456789/472306Personal or environmental causes of happiness: A longitudinal analysisjournal article10.1080/00224549909598363https://www2.scopus.com/inward/record.uri?eid=2-s2.0-0033071801&doi=10.1080%2f00224549909598363&partnerID=40&md5=8247531e7510afbdebd41e2bdb89ee78