Letter from Mark H. McCormack to Walter Keller

Chicago citation style
McCormack, Mark H. Letter from Mark H. McCormack to Walter Keller. 1975-01-20. Retrieved from the Digital Public Library of America, http://credo.library.umass.edu/view/full/mums700-b0003-f029-i063. (Accessed December 18, 2018.)
APA citation style
McCormack, Mark H, (1975-01-20) Letter from Mark H. McCormack to Walter Keller. Retrieved from the Digital Public Library of America, http://credo.library.umass.edu/view/full/mums700-b0003-f029-i063
MLA citation style
McCormack, Mark H. Retrieved from the Digital Public Library of America <http://credo.library.umass.edu/view/full/mums700-b0003-f029-i063>.
Note: These citations are programmatically generated and may be incomplete.