Samuel Richardson (1755). “A collection of the moral and instructive sentiments, maxims, cautions, and reflexions, contained in the histories of Pamela, Clarissa, and Sir Charles Grandison: Digested under proper heads, with references to the volume, ...”, p.4
Florence Nightingale, Michael D. Calabria, Janet A. Macrae (1994). “Suggestions for Thought by Florence Nightingale: Selections and Commentaries”, p.13, University of Pennsylvania Press