Letter from Mark H. McCormack to Frederick W. Heckel

Chicago citation style
McCormack, Mark H, Heckel, Frederick W, United Airlines. Letter from Mark H. McCormack to Frederick W. Heckel. 1969-01-04. Retrieved from the Digital Public Library of America, http://credo.library.umass.edu/view/full/mums700-b0001-f041-i007. (Accessed December 9, 2019.)
APA citation style
McCormack, Mark H, Heckel, Frederick W, United Airlines, (1969-01-04) Letter from Mark H. McCormack to Frederick W. Heckel. Retrieved from the Digital Public Library of America, http://credo.library.umass.edu/view/full/mums700-b0001-f041-i007
MLA citation style
McCormack, Mark H, Heckel, Frederick W, United Airlines. Retrieved from the Digital Public Library of America <http://credo.library.umass.edu/view/full/mums700-b0001-f041-i007>.
Note: These citations are programmatically generated and may be incomplete.