Danielle F. Shanahan, Robert Bush, Kevin J. Gaston, Brenda B. Lin, Julie Dean, Elizabeth Barber & Richard A. Fuller “Health Benefits from Nature Experiences Depend on Dose” https://www.nature.com/... (2020年6月10日参照)
Nature World News “Study: Visiting Parks for 30 Minutes Each Week Could Reduce Risk of High Blood Pressure, Poor Mental Health” http://www.natureworldnews.com/...htm (2020年6月10日参照)