234567 Hammond, E. R. (1985). Informative writing. New York : McGraw-Hill.
Lua i Stíl Chicago (17ú heag.)234567 Hammond, Eugene R. Informative Writing. New York : McGraw-Hill, 1985.
Lua MLA (9ú heag.)234567 Hammond, Eugene R. Informative Writing. New York : McGraw-Hill, 1985.
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