Whipple, G. C. (1923). Vital statistics: An introduction to the science of demography (2nd ed.). John Wiley & sons, inc.; [etc., etc.].
Chicago-referens (17:e uppl.)Whipple, George Chandler. Vital Statistics: An Introduction to the Science of Demography. 2nd ed. New York: John Wiley & sons, inc.; [etc., etc.], 1923.
MLA-referens (8:e uppl.)Whipple, George Chandler. Vital Statistics: An Introduction to the Science of Demography. 2nd ed. John Wiley & sons, inc.; [etc., etc.], 1923.
Varning: dessa hänvisningar är inte alltid fullständigt riktiga.