If you click the "Citation" button in the upper right-hand corner of MITArchivesSpace a citation for the collection will be provided. You will need to add the title for the item and its date.

[Item title, date]. Massachusetts Institute of Technology, Society of Arts Records, AC 11, box X, folder X. Massachusetts Institute of Technology, Department of Distinctive Collections, Cambridge, Massachusetts. 

[Item title, date]. William Barton Rogers Papers, MC 1, box X, folder X. Massachusetts Institute of Technology, Department of Distinctive Collections, Cambridge, Massachusetts.

Example: Letter from Henry B. Rogers to James D. Rogers, December 4, 1856. William Barton Rogers Papers, MC 1, box X, folder X. Massachusetts Institute of Technology, Department of Distinctive Collections, Cambridge, Massachusetts.