Henry David Thoreau, Barry Andrews (2005). “True Harvest: Readings from Henry David Thoreau for Every Day of the Year”, p.107, Unitarian Universalist Association of Congregations
Sir William Osler, Osler Library (1969). “Bibliotheca Osleriana: A Catalogue of Books Illustrating the History of Medicine and Science”, p.10, McGill-Queen's Press - MQUP
Epistola ad Posteros [Letter to Posterity] in "Petrarch : The First Modern Scholar and Man of Letters" by James Harvey Robinson and Henry Winchester Rolfe, (p. 59), 1898.