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
William Buckland (1820). “Vindiciæ Geologicæ: The Connexion of Geology with Religion, Explained in an Inaugural Lecture Delivered Before University of Oxford, May 15, 1819, on the Endowment of Readership in Geology”, p.6