Ying, letters, 1991 May-June, to Christopher, re excessive force

Chicago citation style
Ying, William, Christopher, Warren. Ying, letters, 1991 May-June, to Christopher, re excessive force. 1991-05-01. Retrieved from the Digital Public Library of America, http://digitallibrary.usc.edu/cdm/ref/collection/p15799coll69/id/16888. (Accessed November 18, 2018.)
APA citation style
Ying, William, Christopher, Warren, (1991-05-01) Ying, letters, 1991 May-June, to Christopher, re excessive force. Retrieved from the Digital Public Library of America, http://digitallibrary.usc.edu/cdm/ref/collection/p15799coll69/id/16888
MLA citation style
Ying, William, Christopher, Warren. Retrieved from the Digital Public Library of America <http://digitallibrary.usc.edu/cdm/ref/collection/p15799coll69/id/16888>.
Note: These citations are programmatically generated and may be incomplete.