Smart, W. K. (1916). How to write business letters. A.W. Shaw Co..
Lua i Stíl Chicago (17ú heag.)Smart, Walter Kay. How to Write Business Letters. New York : Chicago [etc.]: A.W. Shaw Co., 1916.
Lua MLA (8ú heag.)Smart, Walter Kay. How to Write Business Letters. A.W. Shaw Co., 1916.
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