R. Waldinger, “What Makes a Good Life? Lessons from the Longest Study on Happiness,” Tedx Talk, November 2015, https://www.ted.com/talks/robert_waldinger_what_makes_a_good_life_lessons_from_the_longest_study_on_happiness/transcript; R. Lund et al., “Stressful Social Relations and Mortality: A Prospective Cohort Study,” Journal of Epidemiology & Community Health 68, no. 8 (2014): doi: 10.1136/jech-2013-203675.
