David G. Hoel et al., ‘The Risks and Benefits of Sun Exposure 2016’, Dermato-Endocrinology 8, no. 1 (December 2016): e1248325, https://doi.org/10.1080/19381980.2016.1248325.
https://www.health.harvard.edu/diseases-and-conditions/benefits-of-moderate-sun-exposure
Johan Moan et al., ‘Addressing the Health Benefits and Risks, Involving Vitamin D or Skin Cancer, of Increased Sun Exposure’, Proceedings of the National Academy of Sciences 105, no. 2 (15 January 2008): 668–73, https://doi.org/10.1073/pnas.0710615105.
J. van der Rhee, E. de Vries, and J. W. W. Coebergh, ‘[Favourable and unfavourable effects of exposure to sunlight]’, Nederlands Tijdschrift Voor Geneeskunde 151, no. 2 (13 January 2007): 118–22.
https://ods.od.nih.gov/factsheets/Vitamin%20D-HealthProfessional/#h3
https://www.stanforddaily.com/2010/10/26/researchers-weigh-pros-and-cons-of-sun-exposure/
http://sunlightinstitute.org/truth-sun-exposure/#_ftn1
https://www.nhs.uk/live-well/healthy-body/how-to-get-vitamin-d-from-sunlight/