Philip Danforth Armour: differenze tra le versioni

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* {{cite journal |last=Cleveland |first=H. I. |authorlink= |coauthors= |date=March 1901 |title=Philip Armour, Merchant |journal=The World's Work: A History of Our Time |volume=I |issue= |pages=540–547 |id= |url= http://books.google.com/books?id=688YPNQ5HNwC&pg=PA540|accessdate=9 luglio 2009 |quote= }}

* Depew, Chauncey M. (1895). "Philip D. Armour, 'The Pig Industry'" in ''100 Years of American Commerce''.