* {{cite book | last=Paul | first=Charles B. | title=Science and Immortality | publisher=Univ of California Press | publication-place=Berkeley ; Los Angeles ; London | date=1980-01-01 | isbn=0-520-03986-6}}
<ref name="o753">{{cite book | last=Paul | first=Charles B. | title=Science and Immortality | publisher=Univ of California Press | publication-place=Berkeley ; Los Angeles ; London | date=1980-01-01 | isbn=0-520-03986-6 | page=}}</ref>