Hudders, E. R. (1916). Indexing and filing: A manual of standard practice ((3d printing).). The Ronald press company.
Lua i Stíl Chicago (17ú heag.)Hudders, Eugene Russell. Indexing and Filing: A Manual of Standard Practice. (3d printing). New York: The Ronald press company, 1916.
Lua MLA (8ú heag.)Hudders, Eugene Russell. Indexing and Filing: A Manual of Standard Practice. (3d printing). The Ronald press company, 1916.
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