MLA
Clements, Lamar. Letter from Reverend Lamar Clements, Acting Chairman of the Atlanta Council on Human Relations, to Richard H. Rich, President of Rich's Department Store, Urging Mr. Rich to Enter in Negotiations with Mayor William B. Hartsfield Regarding the Segregation of the Lunch Counters at Rich's Department Stores. 1960. Stuart A. Rose Manuscript, Archives, and Rare Book Library, Box 37, Folder 3. https://digital.library.emory.edu/purl/423612jmpw-cor.
APA, 6th edition
Clements, L. (1960). Letter from Reverend Lamar Clements, Acting Chairman of the Atlanta Council on Human Relations, to Richard H. Rich, President of Rich's department store, urging Mr. Rich to enter in negotiations with Mayor William B. Hartsfield regarding the segregation of the lunch counters at Rich's department stores (Box 37, Folder 3) [Correspondence]. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/423612jmpw-cor.
Chicago
Clements, Lamar. “Letter from Reverend Lamar Clements, Acting Chairman of the Atlanta Council on Human Relations, to Richard H. Rich, President of Rich's Department Store, Urging Mr. Rich to Enter in Negotiations with Mayor William B. Hartsfield Regarding the Segregation of the Lunch Counters at Rich's Department Stores.” Correspondence. Richard H. Rich Papers, 1902-1981, 1960. Box 37, Folder 3. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/423612jmpw-cor.