University Microfilms International. (1988). Underground press collection: A guide to the microfilm collection : Hoover Institution supplement. UMI.
Chicago-viite (17. p.)University Microfilms International. Underground Press Collection: A Guide to the Microfilm Collection : Hoover Institution Supplement. Ann Arbor, Mich.: UMI, 1988.
MLA-viite (8. p.)University Microfilms International. Underground Press Collection: A Guide to the Microfilm Collection : Hoover Institution Supplement. UMI, 1988.
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