U. S. Library of Congress. (1942). Special facilities for research. U. S. Government Printing Office.
Chicago-viite (17. p.)U. S. Library of Congress. Special Facilities for Research. [Washington: U. S. Government Printing Office, 1942.
MLA-viite (9. p.)U. S. Library of Congress. Special Facilities for Research. U. S. Government Printing Office, 1942.
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