MLA
Rich, Richard H., 1901-1975. Letter from Richard H. Rich, President of Rich's department stores, to Jessie Hill Jr., responding to his letter sent on June 24th, thanking him for the positive feedback to the new restroom and stating that the restrooms and the eating area in the basement store will be of the same quality to those given to the white customers - June 25, 1958. June 25, 1958. Richard H. Rich Papers, 1902-1981. Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/989r2280x0-cor.
APA, 6th edition
Rich, Richard H., 1901-1975. (June 25, 1958)[Letter from Richard H. Rich, President of Rich's department stores, to Jessie Hill Jr., responding to his letter sent on June 24th, thanking him for the positive feedback to the new restroom and stating that the restrooms and the eating area in the basement store will be of the same quality to those given to the white customers - June 25, 1958]. Richard H. Rich Papers, 1902-1981, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/989r2280x0-cor.
Chicago
Rich, Richard H., 1901-1975, Letter from Richard H. Rich, President of Rich's department stores, to Jessie Hill Jr., responding to his letter sent on June 24th, thanking him for the positive feedback to the new restroom and stating that the restrooms and the eating area in the basement store will be of the same quality to those given to the white customers - June 25, 1958, June 25, 1958, Richard H. Rich Papers, 1902-1981, Stuart A. Rose Manuscript, Archives, and Rare Book Library. https://digital.library.emory.edu/purl/989r2280x0-cor.