1. Florence Nightingale and Elizabeth Blackwell
Julia Boyd 
The Lancet 
Volume 373, Issue 9674, Pages (May 2009)
DOI: /S (09)60845-X
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2. Elizabeth Blackwell (1821–1910)
The Lancet  , DOI: ( /S (09)60845-X)
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3. 1856 carte de visite of Florence Nightingale (1820–1910) by H Lenthall
The Lancet  , DOI: ( /S (09)60845-X)
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