Strunk, W. (2007). The elements of style. Penguin Books, USA.
Lua i Stíl Chicago (17ú heag.)Strunk, Wiliam. The Elements of Style. Penguin Books, USA, 2007.
Lua MLA (9ú heag.)Strunk, Wiliam. The Elements of Style. Penguin Books, USA, 2007.
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