Noah Webster (1835). “Instructive and Entertaining Lessons for Youth: With Rules for Reading with Propriety, Illustrated by Examples: Designed for Use in Schools and Families”, p.230
Martin Luther King, Jr. Center for Nonviolent Social Change, National Education Association of the United States (1979*). “Building networks for nonviolent social change: report of the Fourth Annual Summer Institute on Nonviolence, Atlanta, Georgia, July 31-August 2, 1980 [i.e. 1979]”