* {{cite book | last=Johnson | first=Paul | title=The Birth of the Modern | publisher=New York, NY : HarperCollins Publishers | publication-place=New York | date=1991 | isbn=0-06-016574-X}}
<ref name="e756">{{cite book | last=Johnson | first=Paul | title=The Birth of the Modern | publisher=New York, NY : HarperCollins Publishers | publication-place=New York | date=1991 | isbn=0-06-016574-X | page=}}</ref>