Downs, R. B. (1974). Guide to Illinois library resources. Published in cooperation with the Illinois State Library Association by the American Library Association.
Citazione stile Chigago Style (17a edizione)Downs, Robert Bingham. Guide to Illinois Library Resources. Chicago: Published in cooperation with the Illinois State Library Association by the American Library Association, 1974.
Citatione MLA (9a ed.)Downs, Robert Bingham. Guide to Illinois Library Resources. Published in cooperation with the Illinois State Library Association by the American Library Association, 1974.
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