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Lederer, Alyssa M.; Autry, Dana M.; Day, Carol R. T.; Oswalt, Sara B. (18 August 2015). "The Impact of Work and Volunteer Hours on the Health of Undergraduate Students". Journal of American College Health. 63 (6): 403–408. doi:10.1080/07448481.2015.1015028. PMID25692931. S2CID205583711.
Feng, Vincent Xuan; Leong, Tuck Wah (28 November 2017). "Digital meaning". Proceedings of the 29th Australian Conference on Computer-Human Interaction. OZCHI '17. New York, NY, US: Association for Computing Machinery. pp. 366–370. doi:10.1145/3152771.3156138. ISBN978-1-4503-5379-3. S2CID9250571.
Celio, Christine I.; Durlak, Joseph; Dymnicki, Allison (1 September 2011). "A Meta-Analysis of the Impact of Service-Learning on Students". Journal of Experiential Education. 34 (2): 164–181. doi:10.1177/105382591103400205. S2CID11537949.
Oishi, Shigehiro; Diener, Ed; Lucas, Richard E. (1 December 2007). "The Optimum Level of Well-Being: Can People Be Too Happy?". Perspectives on Psychological Science. 2 (4): 346–360. doi:10.1111/j.1745-6916.2007.00048.x. PMID26151972. S2CID17932140.
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Lederer, Alyssa M.; Autry, Dana M.; Day, Carol R. T.; Oswalt, Sara B. (18 August 2015). "The Impact of Work and Volunteer Hours on the Health of Undergraduate Students". Journal of American College Health. 63 (6): 403–408. doi:10.1080/07448481.2015.1015028. PMID25692931. S2CID205583711.