Florence Nightingale, Lynn McDonald (2004). “Florence Nightingale on Public Health Care: Collected Works of Florence Nightingale”, p.31, Wilfrid Laurier Univ. Press
Joseph Story (2012). “A Familiar Exposition of the Constitution of the United States: Containing a Brief Commentary on Every Clause, Explaining the True Nature, Reasons, and Objects Thereof : Designed for the Use of School Libraries and General Readers : with an Appendix, Containing Important Public Documents, Illustrative of the Constitution”, p.265, The Lawbook Exchange, Ltd.