Florence Nightingale, Michael D. Calabria, Janet A. Macrae (1994). “Suggestions for Thought by Florence Nightingale: Selections and Commentaries”, p.114, University of Pennsylvania Press
1852 'Cassandra' pt.4, part of an unpublished work Suggestions for Thought to Searchers after Religious Truth (revised and privately printed1859). Published as an appendix in Ray Strachey The Cause: A Short History of theWomen'sMovement in Great Britain (1928).