Periodicals>Journal Article:  Sone, Nakaya, Ohmori, Shimazu, Higashiguchi, Kakizaki, Kikuchi, Kuriyama, Tsuji (August 2008), Sense of Life Worth Living (Ikigai) and Mortality in Japan: Ohsaki Study, Psychosomatic Medicine, Retrieved on 2017-06-20

Periodicals>Journal Article:  Sone, Nakaya, Ohmori, Shimazu, Higashiguchi, Kakizaki, Kikuchi, Kuriyama, Tsuji (2008), Sense of Life Worth Living (Ikigai) and Mortality in Japan: Ohsaki Study, Psychosomatic Medicine, 70 (6): 709–715, Retrieved on 2016-09-02