Barbara Wertheim Tuchman, Center for the Book, Authors' League of America (1980). “The Book: A Lecture Sponsored by the Center for the Book in the Library of Congress and the Authors' League of America, Presented at the Library of Congress October 17, 1979”, Library of Congress
Samuel Taylor Coleridge (1836). “Aids to reflection in the formation of a manly character on the several grounds of prudence, morality, and religion”, p.193