Copperud, R. H. (1982). Webster's dictionary of usage and style: The reference guide for professional writers, reporters, editors,teachers and students. Avenel Books.
Lua i Stíl Chicago (17ú heag.)Copperud, Roy H. Webster's Dictionary of Usage and Style: The Reference Guide for Professional Writers, Reporters, Editors,teachers and Students. New York: Avenel Books, 1982.
Lua MLA (9ú heag.)Copperud, Roy H. Webster's Dictionary of Usage and Style: The Reference Guide for Professional Writers, Reporters, Editors,teachers and Students. Avenel Books, 1982.
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