Letter from John Muir to [Robert Underwood] Johnson, [19]07 Sep 19

Chicago citation style
John Muir. Letter from John Muir to [Robert Underwood] Johnson, [19]07 Sep 19. [19]07 Sep 19. Retrieved from the Digital Public Library of America, http://ark.cdlib.org/ark:/13030/kt429033sd. (Accessed December 9, 2018.)
APA citation style
John Muir, ([19]07 Sep 19) Letter from John Muir to [Robert Underwood] Johnson, [19]07 Sep 19. Retrieved from the Digital Public Library of America, http://ark.cdlib.org/ark:/13030/kt429033sd
MLA citation style
John Muir. Retrieved from the Digital Public Library of America <http://ark.cdlib.org/ark:/13030/kt429033sd>.
Note: These citations are programmatically generated and may be incomplete.