MLA
Coller, Bill. Letter from Bill Coller to H. Prentice Miller, Dean of Alumni at Emory University, Giving Him Addresses of the Nieces of Allen Bunce, Who Have Materials to Donate to Emory University Regarding the Emory Unit - May 31, 1979. 1979. Robert W. Woodruff Health Sciences Center. Library, Box 1, Folder 10. https://digital.library.emory.edu/purl/535t76hg54-cor.
APA, 6th edition
Coller, B. (1979). Letter from Bill Coller to H. Prentice Miller, Dean of Alumni at Emory University, giving him addresses of the nieces of Allen Bunce, who have materials to donate to Emory University regarding the Emory Unit - May 31, 1979 (Box 1, Folder 10) [Letters (correspondence)]. Robert W. Woodruff Health Sciences Center. Library. https://digital.library.emory.edu/purl/535t76hg54-cor.
Chicago
Coller, Bill. “Letter from Bill Coller to H. Prentice Miller, Dean of Alumni at Emory University, Giving Him Addresses of the Nieces of Allen Bunce, Who Have Materials to Donate to Emory University Regarding the Emory Unit - May 31, 1979.” Letters (correspondence). Emory Unit Collection, 1979. Box 1, Folder 10. Robert W. Woodruff Health Sciences Center. Library. https://digital.library.emory.edu/purl/535t76hg54-cor.