References
^ Friedman, Howard S.; Martin, Leslie R. (2014). The Longevity Project Surprising Discoveries for Health and Long Life from the Landmark Eight-Decade Study, Hudson Street Press. BiggerBooks. ISBN 9781594630750 (revised Nov 2023)^ (2013). The Longevity Project Surprising Discoveries for Health and Long Life from the Landmark Eight-Decade Study ECampus. ISBN 9781594630750 (revised Apr 2015)
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