John Muir (2015). “My First Summer in the Sierra (With Original Drawings & Photographs): Adventure Memoirs, Travel Sketches & Wilderness Studies”, p.22, e-artnow
"Hoyt's New Cyclopedia Of Practical Quotations" by Jehiel Keeler Hoyt, letter describing the death of Bishop Mackenzie in Africa (March 1862), (pp. 388-390), 1922.