Miriam Intrator, Rare Books Librarian in Mahn Center has created a RESEARCHING WITH ARCHIVES AND SPECIAL COLLECTIONS guide.
Sections of interest: CITING PRIMARY SOURCES IN MAHN CENTER, FINDING OTHER ARCHIVAL SOURCES
Otherwise, the basic elements of a primary source citation are as follows:
No matter the style or format, citations for rare or unique materials should include enough information to identify and locate the original work:
Optimally, a citation for rare and/or unpublished works will include other information to further identify and locate the original copy of the work, which may include: